Which is a better buy, 3 pounds for $8.31 or 5 pounds for $12.95?

Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?

With this one. will mark brainliest

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?