In October, Harry gave his wife, Anna, $8000 for household expenditure. Anna spent 60% of the sum on rental, 10% on food and saved the rest. In November, Harry reduced the sum he gave to Anna. Anna spent the same amount on rental and reduced the amount she spent on food by 30%. She saved the remaining 20% of the sum given to her in November. By what percentage was the sum given to Anna reduced by?

	Rental	Food	Savings	Total
Before	60%	10%	30%	$8000
Change		- 3%	- ?	- ?
After	60%	7%
Comparing the amounts spent in November	80 u		20 u	100 u

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

Amount that Harry reduced on food in percent
= 30% x 10%
= ³⁰₁₀₀ x 10
= 3%

Total amount that Harry spent on rental and food in percent
= 60% + 7%
= 67%

100% → 8000

1% → 8000 ÷ 100 = 80

67% → 67 x  80 = 5360

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

80 u = 67% 

80 u = 5360

1 u = 5360 ÷ 80 = 67

Amount that Harry gave to Anna in November
= 100 u
= 100 x 67
= $6700

Amount that Anna received less from Harry from October to November
= 8000 - 6700
= $1300

Percentage that the sum given to Anna was reduced by from October to November
= ¹³⁰⁰₈₀₀₀ x 100%
= 16.25%

Answer(s): 16.25%