If a merchant deposits $1500 at the end of each tax year in a n ira paying interest at the rate of 4%/year compounded annually, how much will she have in her account at the end of 25 years if you can show the work that would be great, i've been having a hard time with this practice problem.
thanks to anyone in advance !

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z