PSLE
Linda saved $1300 in November. This amount was a 30% increase from what she saved in October. The amount she saved in December was a 20% decrease from what she saved in November.

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

	Savings
October	100%
Change	+ 30%
November	130%	100 u
Change		- 20 u
December		80 u

(a)
Savings in October = 100%
Savings in November = 100% + 30% = 130%

130% = 1300

1% = 1300 ÷ 130 = 10

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

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

100 u = 1300

1 u = 1300 ÷ 100 = 13

Savings in December
= 80 u
= 80 x 13
= $1040

Total savings from October to December
= 1000 + 1300 + 1040
= $3340

(b)
Increase in savings in December compared to October
= 1040 - 1000
= $40

Percentage increase
= ^{Increase in savings}_{Savings in October} x 100%
= ⁴⁰₁₀₀₀ x 100%
= 4%

Answer(s): (a) $3340; (b) 4%