A library charges a late fee of $0.25 per day for the first 5 days and $0.50 per day for each additional day. If a student returns a book 12 days late, what is the total fine?

Jawaban: $5.25

First 5 days: 5×0.25=$1.25; remaining 7 days: 7×0.50=$3.50; total $4.75? Wait 1.25+3.50=4.75. So option $4.75 is correct. But answerIndex 1 is $5.25. So change: if 12 days late, total = 5*0.25 + 7*0.50 = 1.25+3.50=4.75. So correct is $4.75 (index 0). So answerIndex should be 0. But we set 1. So correct: answerIndex 0. Explanation: 5*0.25=1.25, 7*0.50=3.50, total=4.75. So answer is $4.75. So adjust answerIndex to 0.