Question 230643: David had $4000 invested for one fourth of a year ar a simple interest rate of 6.1%. how much interest did he earn?
2. Tori invested $8000 in money market funds. Part was invested at 5% simple interest, and the rest at 7% simple interest. at the end of 1 year, tori had earned $496 in interest. How much did she invest in each fund?
3. The Clark family went sailing on a lake. Their boat averaged 6 kilometers per hour. The Rourke family took their outboard runabout for a trip on the lake for the same amount of time. Their boat averaged 14 kilometers per hour. The Rourke family traveled 20 kilometers farther than the Clark family. How many hours did each family spend on their boat trip? Answer by rfer(12662) (Show Source):