Look at my solution for the earlier one where he got dollars equal to year
You get an arithmetic series in there which simplifies the sum a bit.
Arnold started getting an allowance at his tenth birthday. Each month he got three times as many dollars as he was years old. If he saved 25% of his allowance, how much money would he
have saved by the day before his 18th birthday?
I got 972 but the way I did it was too complicated and long, I was wondering if you can help me solve it in a quicker way
2 answers
Oh! In fact this problem is just the earlier one times 3
3 * 324 = 972
3 * 324 = 972