$L_1$ requires $3$ V @ $200$ mA

$L_2$ requires $6$V @ $200$ mA

$L_3$ requires $12$ V @ $150$ mA

$L_{4\text{r}\text{e}\text{q}\text{u}\text{i}\text{r}\text{e}\text{s}}20V$ @ $25$ mA

$\backslash$table$[[$Find:$,$Answer:,Find:,Answer:,Find:,Answer:$],[V_T,,R_3,,V_C,],[I_T,,R_4,,V_D,],[R_T,,R_{L1},,,],[V_1,,R_{L2},,,],[V_2,,R_{L3},,,],[V_3,,R_{L1},,,],[V_4,,P_T,,,],[I_1,20$ mA$,P_{L1},,,],[I_2,,P_{L2},,,],[I_3,,P_{L3},-,,],[I_4,,P_{L4},,,],[R_1,,V_A,,,],[R_2,,V_B,,,]]$