Fabian sold 142 more strawberry muffins than apple muffins on Friday. On Saturday, the number of apple muffins he sold decreased by 40% while the number of strawberry muffins he sold remained the same. He sold each tart for $5.10. He sold a total of 518 muffins on Saturday. How much money did he receive from the sale of muffins on both days?

	Strawberry muffins	Apple muffins	Total
Comparing strawberry and apple muffins  at first	142 more
Before	5 u + 142	5 u	10 u + 142
Change		- 2 u
After	5 u + 142	3 u	8 u + 142

40% = ⁴⁰₁₀₀ = ²₅

Total number of muffins sold on Saturday
= 5 u + 142 + 3 u
= 8 u + 142

8 u + 142 = 518
8 u = 518 - 142
8 u = 376 

1 u = 376 ÷ 8 = 47

Total number of muffins sold on Friday
= 5 u + 142 + 5 u
= 10 u + 142

Total number of muffins sold on both days
= 8 u + 142 + 10 u + 142
= 18 u + 284
= 18 x 47 + 284
= 846 + 284
= 1130

Total amount received from the sale of muffins on both days
= 1130 x 5.10
= $5763

Answer(s): $5763