Harry sold 137 more vanilla tarts than chocolate chip tarts on Saturday. On Sunday, the number of chocolate chip tarts he sold decreased by 10% while the number of vanilla tarts he sold remained the same. He sold each tart for $3.20. He sold a total of 1068 tarts on Sunday. How much money did he receive from the sale of tarts on both days?

	Vanilla tarts	Chocolate chip tarts	Total
Comparing vanilla and chocolate chip tarts  at first	137 more
Before	10 u + 137	10 u	20 u + 137
Change		- 1 u
After	10 u + 137	9 u	19 u + 137

10% = ¹⁰₁₀₀ = ¹₁₀

Total number of tarts sold on Sunday
= 10 u + 137 + 9 u
= 19 u + 137

19 u + 137 = 1068
19 u = 1068 - 137
19 u = 931 

1 u = 931 ÷ 19 = 49

Total number of tarts sold on Saturday
= 10 u + 137 + 10 u
= 20 u + 137

Total number of tarts sold on both days
= 19 u + 137 + 20 u + 137
= 39 u + 274
= 39 x 49 + 274
= 1911 + 274
= 2185

Total amount received from the sale of tarts on both days
= 2185 x 3.20
= $6992

Answer(s): $6992