In March, Oscar gave his wife, Pamela, $4000 for household expenditure. Pamela spent 60% of the sum on rental, 10% on food and saved the rest. In April, Oscar reduced the sum he gave to Pamela. Pamela spent the same amount on rental and reduced the amount she spent on food by 20%. She saved the remaining 20% of the sum given to her in April. By what percentage was the sum given to Pamela reduced by?

	Rental	Food	Savings	Total
Before	60%	10%	30%	$4000
Change		- 2%	- ?	- ?
After	60%	8%
Comparing the amounts spent in April	80 u		20 u	100 u

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

Amount that Oscar reduced on food in percent
= 20% x 10%
= ²⁰₁₀₀ x 10
= 2%

Total amount that Oscar spent on rental and food in percent
= 60% + 8%
= 68%

100% → 4000

1% → 4000 ÷ 100 = 40

68% → 68 x  40 = 2720

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

80 u = 68% 

80 u = 2720

1 u = 2720 ÷ 80 = 34

Amount that Oscar gave to Pamela in April
= 100 u
= 100 x 34
= $3400

Amount that Pamela received less from Oscar from March to April
= 4000 - 3400
= $600

Percentage that the sum given to Pamela was reduced by from March to April
= ⁶⁰⁰₄₀₀₀ x 100%
= 15%

Answer(s): 15%