In May, Owen gave his wife, Eva, $8000 for household expenditure. Eva spent 60% of the sum on rental, 10% on food and saved the rest. In June, Owen reduced the sum he gave to Eva. Eva spent the same amount on rental and reduced the amount she spent on food by 10%. She saved the remaining 20% of the sum given to her in June. By what percentage was the sum given to Eva reduced by?

	Rental	Food	Savings	Total
Before	60%	10%	30%	$8000
Change		- 1%	- ?	- ?
After	60%	9%
Comparing the amounts spent in June	80 u		20 u	100 u

Amount that Owen saved in percent
= 100% - 60% - 10%
= 30%

Amount that Owen reduced on food in percent
= 10% x 10%
= ¹⁰₁₀₀ x 10
= 1%

Total amount that Owen spent on rental and food in percent
= 60% + 9%
= 69%

100% → 8000

1% → 8000 ÷ 100 = 80

69% → 69 x  80 = 5520

The total amount that Owen spent on rental and food is repeated. 

80 u = 69% 

80 u = 5520

1 u = 5520 ÷ 80 = 69

Amount that Owen gave to Eva in June
= 100 u
= 100 x 69
= $6900

Amount that Eva received less from Owen from May to June
= 8000 - 6900
= $1100

Percentage that the sum given to Eva was reduced by from May to June
= ¹¹⁰⁰₈₀₀₀ x 100%
= 13.75%

Answer(s): 13.75%