I basically converted APR compounded monthly to APR compounded 6 monthly and plugged that into the PV annuity equation. Seems like its not the correct way of solving. How should I approach this one?

Meanng Exetra aueshon Suppore me uterest rate is 1-APP with nUnthly upouuding what is the annuity that pays 2i every 6 mouth fer t ears an psesent value ef 3 4 pV 7 9*1.3-9 40-21. (0.408 YBowery& ORth ne 7 yeavs compounded ly 14 PV=81 (gan) f16.88 PV (annuity of C for N periods with interest rate r) C x (1 + r