Peter sold 73 more vanilla cookies than banana cookies on Thursday. On Friday, the number of banana cookies he sold decreased by 10% while the number of vanilla cookies he sold remained the same. He sold each tart for $1.40. He sold a total of 662 cookies on Friday. How much money did he receive from the sale of cookies on both days?

	Vanilla cookies	Banana cookies	Total
Comparing vanilla and banana cookies  at first	73 more
Before	10 u + 73	10 u	20 u + 73
Change		- 1 u
After	10 u + 73	9 u	19 u + 73

10% = ¹⁰₁₀₀ = ¹₁₀

Total number of cookies sold on Friday
= 10 u + 73 + 9 u
= 19 u + 73

19 u + 73 = 662
19 u = 662 - 73
19 u = 589 

1 u = 589 ÷ 19 = 31

Total number of cookies sold on Thursday
= 10 u + 73 + 10 u
= 20 u + 73

Total number of cookies sold on both days
= 19 u + 73 + 20 u + 73
= 39 u + 146
= 39 x 31 + 146
= 1209 + 146
= 1355

Total amount received from the sale of cookies on both days
= 1355 x 1.40
= $1897

Answer(s): $1897