In March, Oliver gave his wife, Hazel, $6000 for household expenditure. Hazel spent 60% of the sum on rental, 10% on food and saved the rest. In April, Oliver reduced the sum he gave to Hazel. Hazel 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 Hazel reduced by?

	Rental	Food	Savings	Total
Before	60%	10%	30%	$6000
Change		- 2%	- ?	- ?
After	60%	8%
Comparing the amounts spent in April	80 u		20 u	100 u

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

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

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

100% → 6000

1% → 6000 ÷ 100 = 60

68% → 68 x  60 = 4080

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

80 u = 68% 

80 u = 4080

1 u = 4080 ÷ 80 = 51

Amount that Oliver gave to Hazel in April
= 100 u
= 100 x 51
= $5100

Amount that Hazel received less from Oliver from March to April
= 6000 - 5100
= $900

Percentage that the sum given to Hazel was reduced by from March to April
= ⁹⁰⁰₆₀₀₀ x 100%
= 15%

Answer(s): 15%