1. how do I explain a negative percent for sales that is positive compared to negative sales the prior year? Last sales was a -$1,296.00 and this year sales is $356.00 but when doing this formula of =(this year - last year)/last year the result is a negative percent. How do I explain the formula is correct although the sales is an increase?

2.Maya decides to save for 2 years. She opens a savings account with $400 . The account pays simple interest at an annual rate of 3%. She doesn't make any more deposits.

1.) how do I find the total interest maya will earn?

2.) what will the total amount in the account be including interest

3.Derive a formula for periodic payment

4.Mae Ling earns a weekly salary of $370 plus a 7.0% commission on sales at a gift shop. How much would she make in a work week if she sold $4,900 worth of merchandise?

5.A bank invested $450,000 last year in mutual funds. The conservative fund earned 9% simple interest. The growth fund earned 14% simple interest. At the end of the year, the bank had earned $48000 from these mutual funds. How much did it invest in each fund?

6.A principal of $2100 was invested in the stock market. Some shares of World oil were bought at $7.50 per share. Some shares of Zinco Mines were bought at $3.25 per share. The total number of shares was 450. How many shares of each stock were bought?

7.Linda needs to have an annuity payment of $200, at the beginning of each year for 17 years. How much should she deposit now at 11% interest, compounded annually, to yield this payment?

8.Suppose that 5500 is placed in an account that pays 16% interest compounded each year assume that no withdrawal are made from the account find the amount in the account at the end of 1year

9.How long will it take for money to triple with interest rate of r

10.Shawna earns $550 per week. She gets 15% deducted for taxes. How much money does she pay in takes each week?