need help not sure what I am doing wrong. Thank you.

Mendez Company has identified an investment project with the following cash flows. a. If the discount rate is 11 percent, what is the present value of these cash flows? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g.32.16.) b. What is the present value at 18 percent? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g.. 32.16.) c. What is the present value at 24 percent? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.)