Alimited-edition poster increases in value each year. after 1 year, the poster is worth $20.70. after 2 years, it is worth $23.81. which equation can be used to find the value, y, after x years? (round money values to the nearest penny.)
a. y = 18(1.15)x

b. y = 18(0.15)x

c. y = 20.7(1.15)x

d. y = 20.7(0.15)