PLEASE HELP I AM TIMED!!!!

Yvonne put $4,000 in a savings account. At the end of 3 years, the account had earned $960 in simple interest. (NEED HELP WITH THIS QUESTION!) a. How much does she have in her account at the end of 3 years? b. At what annual simple interest rate did the account grow? Show your work. c. How many more dollars would she have in her account if the interest rate were 1% greater? Show your work. (4 points)