PSLE
Linda spent $880 in August. This amount was a 10% increase from what she spent in July. The amount she spent in September was a 40% decrease from what she spent in August.

1. What was the total amount that Linda spent from July to September?
2. What was the percentage decrease in the amount Linda spent in September compared to July?

	Spending
July	100%
Change	+ 10%
August	110%	100 u
Change		- 40 u
September		60 u

(a)
Spending in July = 100%
Spending in August = 100% + 10% = 110%

110% = 880

1% = 880 ÷ 110 = 8

Spending in July
= 100% 
= 100 x 8
= $800

Spending in August = 100 u
Spending in September = 100 u - 40 u = 60 u 

100 u = 880

1 u = 880 ÷ 100 = 8.8

Spending in September
= 60 u
= 60 x 8.8
= $528

Total spending from July to September
= 800 + 880 + 528
= $2208

(b)
Decrease in spending in September compared to July
= 800 - 528 
= $272

Percentage decrease
= ^{Decrease in spending}_{Spending in July} x 100%
= ²⁷²₈₀₀ x 100%
= 34%

Answer(s): (a) $2208; (b) 34%