PSLE
Linda saved $340 in September. This amount was a 15% decrease from what she saved in August. The amount she saved in October was a 20% increase from what she saved in September.

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

	Savings
August	100%
Change	- 15%
September	85%	100 u
Change		+ 20 u
October		120 u

(a)
Savings in August = 100%
Savings in September = 100% - 15% = 85%

85% = 340

1% = 340 ÷ 85 = 4

Savings in August
= 100% 
= 100 x 4
= $400

Savings in September = 100 u
Savings in October = 100 u + 20 u = 120 u 

100 u = 340

1 u = 340 ÷ 100 = 3.4

Savings in October
= 120 u
= 120 x 3.4
= $408

Total savings from August to October
= 400 + 340 + 408
= $1148

(b)
Increase in savings in October compared to August
= 408 - 400
= $8

Percentage increase
= ^{Increase in savings}_{Savings in August} x 100%
= ⁸₄₀₀ x 100%
= 2%

Answer(s): (a) $1148; (b) 2%