Hello! So to solve this problem, we will first have to add 2 deposits of $40 in his bank account. Then, we can take away $65 from that amount, and leave him with $15 left in 2 weeks. Then, we can add 10 weeks of $40 for $400, and get $415 in the bank in 12 weeks. Then, you can add an extra $80 from the last 2 weeks to finally reach $495. It will take Steven 14 weeks to be able to pay back his sister and the bike. The answer is C: 14 weeks.