Applications: interest and mixtures

Ethanol fuel mixtures have “E” numbers that indicate the percentage of ethanol in the mixture by volume. For example, E10 is a mixture of 10% ethanol and 90% gasoline. How much E5 should be mixed... more

James invested some money at 7% interest. James also invested $97 more than 2 times that amount at 5%. How much is invested at each rate if James receives $315.61 in interest after one year? (Round... more

George invested some money at 5% interest. George also invested $56 more than 5 times that amount at 10%. How much is invested at each rate if George receives $1434.50 in interest after one year?... more

I need some help on setting up this problem, and how to find the formula to get the correct answer.. this sounds like a different language like where do I start? Can I put this in a table or a... more

I need some help on setting up this problem, and how to find the formula to get the correct answer.. this sounds like a different language like where do I start? Can I put this in a table or a... more

I need some help on setting up this problem, and how to find the formula to get the correct answer..Here it is: A retiree needs a yearly income of $13,o00 from her IRA to help fund her retirement.... more

john invested some money in a certificate of deposit that earns 5.5% annual simple interest and $ 8,000 more in a municipal bond that earns 6% annual simple interest. if the amount of interest... more

A metallurgist has one alloy containing 42% aluminum and another containing 64% aluminum. How many pounds of each alloy must he use to make 45 pounds of a third alloy containing 51% aluminum?... more

Tom invested part of $12,000 in a 5% simple interest account and the remainder in 7.5% simple interest account. If the total interest earned from the two investments in one year was $775, how much... more

James invested some money at 15% interest.  James also invested $229 more than 4 times that amount at 6%.  How much is invested at each rate if James receives $1452.84 interest after 1 year? (Round... more

 How many pounds of each alloy must he use to make 50 pounds of a third alloy containing 53% aluminum? (Round off answers to the nearest hundredth.)