PSLE
Linda saved $600 in October. This amount was a 50% increase from what she saved in September. The amount she saved in November was a 20% decrease from what she saved in October.

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

	Savings
September	100%
Change	+ 50%
October	150%	100 u
Change		- 20 u
November		80 u

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

150% = 600

1% = 600 ÷ 150 = 4

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

Savings in October = 100 u
Savings in November = 100 u - 20 u = 80 u 

100 u = 600

1 u = 600 ÷ 100 = 6

Savings in November
= 80 u
= 80 x 6
= $480

Total savings from September to November
= 400 + 600 + 480
= $1480

(b)
Increase in savings in November compared to September
= 480 - 400
= $80

Percentage increase
= ^{Increase in savings}_{Savings in September} x 100%
= ⁸⁰₄₀₀ x 100%
= 20%

Answer(s): (a) $1480; (b) 20%