Under what value of b, m, and R would N = 750 after 20 generations

Constants me) 0.5 1.24 Variables NE b. per capita total m, per capita total deltaNt deltaNUN birth rate births death rate deaths 0 1 1.24 0.505 0.505 0.735 0.735 1 1.735 1.23265 2.138648 0.508675 0.882551 1.256097 0.723975 2 2.991097 122008903 3.649404 0.514955483 1.540282 2.109123 0.705134 3 5.100219 1.19899781 6.115152 0.525501096 2.680171 3.434981 0.673497 4 8.5352 1.164648 9.940504 0.542676 4.631848 5.308655 0.621972 5 13.84386 1.11156144 15.3883 0.569219278 7.880189 7.508107 0.542342 8 21.35196 1.03648038 22.13089 0.606759811 12.95551 9.175377 0.429721 7 30,52734 0.94472661 28.83999 0.652636697 19.92326 8.916728 0.29209 8 39.44407 0.85555933 33.74674 0.697220336 27.50121 6.245534 0.158339 9 45.6896 0.79310399 36.2366 0.728448005 33.2825 2.954106 0.064656 10 48.64371 0.76356293 37.14253 0.743218536 36.1529 0.989627 0.020344 11 49.63333 0.75366666 37.40699 0.748166669 3713401 0.272983 0.0055 12 49.90632 0.75093683 37.47649 0.749531584 37 40636 0.070131 0.001405 13 49.97645 0.75023552 37 49411 0.749882238 37.47645 0.017656 0.000353 14 49.9941 0.75005896 37 49853 0.749970518 37.4941 0.004422 8.84E-05 15 49.99853 0.75001475 37 49963 0.749992627 37.49853 0.001106 2.21E-05 16 49 99963 0.75000369 37.49991 0.749998157 37.49963 0.000277 5.53E-06 17 49.99991 0.75000092 37.49998 0.749999539 37.49991 6.91E-05 1.38E-06 18 49 99998 0.75000023 37.49999 0.749999885 37.49998 1.73E-05 3.46E-07 19 49.99999 0.75000006 37.5 0.749999971 37.49999 4.32E-06 8.64E-08 20 50 0.75000001 37.5 0.749999993 37.5 -50 b 1.25 b' -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.75 K 50 #VALUE! -1 -1 -1 -1 -1 -1 -1 - 1 .1 -1 -1 -1 -1 -1 - 1 Constants me) 0.5 1.24 Variables NE b. per capita total m, per capita total deltaNt deltaNUN birth rate births death rate deaths 0 1 1.24 0.505 0.505 0.735 0.735 1 1.735 1.23265 2.138648 0.508675 0.882551 1.256097 0.723975 2 2.991097 122008903 3.649404 0.514955483 1.540282 2.109123 0.705134 3 5.100219 1.19899781 6.115152 0.525501096 2.680171 3.434981 0.673497 4 8.5352 1.164648 9.940504 0.542676 4.631848 5.308655 0.621972 5 13.84386 1.11156144 15.3883 0.569219278 7.880189 7.508107 0.542342 8 21.35196 1.03648038 22.13089 0.606759811 12.95551 9.175377 0.429721 7 30,52734 0.94472661 28.83999 0.652636697 19.92326 8.916728 0.29209 8 39.44407 0.85555933 33.74674 0.697220336 27.50121 6.245534 0.158339 9 45.6896 0.79310399 36.2366 0.728448005 33.2825 2.954106 0.064656 10 48.64371 0.76356293 37.14253 0.743218536 36.1529 0.989627 0.020344 11 49.63333 0.75366666 37.40699 0.748166669 3713401 0.272983 0.0055 12 49.90632 0.75093683 37.47649 0.749531584 37 40636 0.070131 0.001405 13 49.97645 0.75023552 37 49411 0.749882238 37.47645 0.017656 0.000353 14 49.9941 0.75005896 37 49853 0.749970518 37.4941 0.004422 8.84E-05 15 49.99853 0.75001475 37 49963 0.749992627 37.49853 0.001106 2.21E-05 16 49 99963 0.75000369 37.49991 0.749998157 37.49963 0.000277 5.53E-06 17 49.99991 0.75000092 37.49998 0.749999539 37.49991 6.91E-05 1.38E-06 18 49 99998 0.75000023 37.49999 0.749999885 37.49998 1.73E-05 3.46E-07 19 49.99999 0.75000006 37.5 0.749999971 37.49999 4.32E-06 8.64E-08 20 50 0.75000001 37.5 0.749999993 37.5 -50 b 1.25 b' -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.75 K 50 #VALUE! -1 -1 -1 -1 -1 -1 -1 - 1 .1 -1 -1 -1 -1 -1 - 1