Question

You decide to save money to pay the fees for your hobby classes and save $22 in the first week. If you save $3 more each week than in the preceding week, how much money will you have by the end of the 10th week?

Answer 1

22 + [22 + 3(1)] + [22 + 3(2)] + . . . + [22 + 3(9)] = (10)(22) + 3(1 + 2 + 3 + . . . + 9) = (10)(22) + 3(9)(10)/2 = $355