¹₂ of Asher's savings comprised of 10-cent coins and 50-cent coins. Asher used some 10-cent coins to purchase a flying saucer. The number of 50-cent coins left was 40% more than the number of 10-cent coins left. Given that Asher had 10 more 50-cent coins than 10-cent coins left in the end, find the amount of money Asher spent on the flying saucer.

	10-cent coins	50-cent coins
Before	1x7 = 7 u	1x7 = 7 u
Change	- 2 u
After	5x1 = 5 u	7x1 = 7 u

Fraction of Asher's savings that comprised of 50-cent coins
= 1 - ¹₂
= ¹₂

Number of 50-cents coins in the end in percentage
= 100% + 40%
= 140%

140% = ¹⁴⁰₁₀₀ = ⁷₅

Number of 50-cent coins remains unchanged. Make the number of 50-cent coins the same.  LCM of 1 and 7 is 7.

Number of more 50-cent coins than 10-cent coins
= 7 u - 5 u
= 2 u

2 u = 10

1 u = 10 ÷ 2 = 5

Number of 10-cent coins spent on the flying saucer 
= 7 u - 5 u
= 2 u
= 2 x 5
= 10

Amount that Asher spent on the flying saucer 
= 10 x 0.1
= $1

Answer(s): $1