PSLE
Linda saved $1500 in September. This amount was a 50% increase from what she saved in August. The amount she saved in October was a 30% 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 increase in the amount Linda saved in October compared to August?

	Savings
August	100%
Change	+ 50%
September	150%	100 u
Change		- 30 u
October		70 u

(a)
Savings in August = 100%
Savings in September = 100% + 50% = 150%

150% = 1500

1% = 1500 ÷ 150 = 10

Savings in August
= 100% 
= 100 x 10
= $1000

Savings in September = 100 u
Savings in October = 100 u - 30 u = 70 u 

100 u = 1500

1 u = 1500 ÷ 100 = 15

Savings in October
= 70 u
= 70 x 15
= $1050

Total savings from August to October
= 1000 + 1500 + 1050
= $3550

(b)
Increase in savings in October compared to August
= 1050 - 1000
= $50

Percentage increase
= ^{Increase in savings}_{Savings in August} x 100%
= ⁵⁰₁₀₀₀ x 100%
= 5%

Answer(s): (a) $3550; (b) 5%