Can someone pls me on part b ill love you for like ever : ')

I feel like the way this question is worded makes it difficult to answer but if im correct it should be simple and they'll have to add $295 to their account because if they had $245 in there originally and however many weeks they bought tickets turned out to be $240 so that's $5 left over and then 15 per week times 200 weeks equals 300 and 295+5=300 but that's just my answer and who knows if I'm right