The Jazz Band has 18 members. Each member must pay $12.60 for a jazz band t-shirt. Last week 10 members paid for their t-shirt and this week the remaining members paid for their t-shirt.
How much money was collected for the jazz band t-shirts this week?
There are 18 members in total, and 10 members paid last week, leaving 18 - 10 = 8 members who paid this week.
Each member must pay $12.60 for a t-shirt, so the total amount collected this week is 8 * $12.60 = $100.80.
Therefore, $100.80 was collected for the jazz band t-shirts this week.