In April, Justin gave his wife, Gillian, $8000 for household expenditure. Gillian spent 60% of the sum on rental, 20% on food and saved the rest. In May, Justin reduced the sum he gave to Gillian. Gillian spent the same amount on rental and reduced the amount she spent on food by 25%. She saved the remaining 20% of the sum given to her in May. By what percentage was the sum given to Gillian reduced by?

	Rental	Food	Savings	Total
Before	60%	20%	20%	$8000
Change		- 5%	- ?	- ?
After	60%	15%
Comparing the amounts spent in May	80 u		20 u	100 u

Amount that Justin saved in percent
= 100% - 60% - 20%
= 20%

Amount that Justin reduced on food in percent
= 25% x 20%
= ²⁵₁₀₀ x 20
= 5%

Total amount that Justin spent on rental and food in percent
= 60% + 15%
= 75%

100% → 8000

1% → 8000 ÷ 100 = 80

75% → 75 x  80 = 6000

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

80 u = 75% 

80 u = 6000

1 u = 6000 ÷ 80 = 75

Amount that Justin gave to Gillian in May
= 100 u
= 100 x 75
= $7500

Amount that Gillian received less from Justin from April to May
= 8000 - 7500
= $500

Percentage that the sum given to Gillian was reduced by from April to May
= ⁵⁰⁰₈₀₀₀ x 100%
= 6.25%

Answer(s): 6.25%