PSLE
Linda saved $240 in September. This amount was a 20% increase from what she saved in August. The amount she saved in October was a 50% decrease from what she saved in September.

1. What was the total amount that Linda saved from August to October?
2. What was the percentage decrease in the amount Linda saved in October compared to August?

	Savings
August	100%
Change	+ 20%
September	120%	100 u
Change		- 50 u
October		50 u

(a)
Savings in August = 100%
Savings in September = 100% + 20% = 120%

120% = 240

1% = 240 ÷ 120 = 2

Savings in August
= 100% 
= 100 x 2
= $200

Savings in September = 100 u
Savings in October = 100 u - 50 u = 50 u 

100 u = 240

1 u = 240 ÷ 100 = 2.4

Savings in October
= 50 u
= 50 x 2.4
= $120

Total savings from August to October
= 200 + 240 + 120
= $560

(b)
Decrease in savings in October compared to August
= 200 - 120 
= $80

Percentage decrease
= ^{Decrease in savings}_{Savings in August} x 100%
= ⁸⁰₂₀₀ x 100%
= 40%

Answer(s): (a) $560; (b) 40%