Yesterday you borrowed $30 from your brother. Every day that you don't pay it back, you owe $2.00 more. So today, day 1, you owe him $32.00; on day 2 you will owe him $34.00; on day 3 you will owe him $36.00, etc. If you still haven't paid him back, how much will you owe him on day 22?

Answer 1

Since every day that passes you owe $2 more, on day 22, you will owe $32 + ($2 * (22 - 1)) = $32 + ($2 * 21) = $32 + $42 = $<<32+2*21=74>>74. Answer: \boxed{74}.