Cathy and her twin sister Carley both age 25 each belive they have the best savings plan. Cathy saved $5,000 as the end of each year for ten...

a. Both strategies are equal as they have equal account balances at age 65

b Cathy's strategy is better because she has a greater account balance at age 65.

c. carleys strategy is better because she has a greater account balance at age 65

d. neither strategy is better because carley has a greater account balance but Cathy contributed less

Please explain how to work this problem hopefully in excel