I need someone to explain to me how to do this problem (the amounts are and should be in Dominican pesos).

5.- How much would you have to invest today to receive:

a) 19,400 pesos in 9 years at 12%.

b) 25,600 pesos in 13 years at 14%.

c) 9,200 pesos each year for 15 years at 8%.

d) 63,300 pesos each year for 45 years at 8%.