5. Rhonda make jewelry at home and she sells her products on eBay. Last month, she made 130 bracelets? Since then, she has sold 91 bracelets. What percent of the bracelets have been sold so far? THE ANSWER IS 70% BUT I DONT GET HOW TO GET THE ANSWER IF THAT MAKES SENSE

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