Hey guys I need help with this exercise.. can u plz write the whole equation and how u figured it out plz?? 12 points...!!!

Math Problem: Jack buys a pair of jeans on sale at 37% off. He pays $53.55. What was the original cost of the jeans?

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