PSLE
Linda spent $945 in October. This amount was a 35% increase from what she spent in September. The amount she spent in November was a 20% decrease from what she spent in October.

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

	Spending
September	100%
Change	+ 35%
October	135%	100 u
Change		- 20 u
November		80 u

(a)
Spending in September = 100%
Spending in October = 100% + 35% = 135%

135% = 945

1% = 945 ÷ 135 = 7

Spending in September
= 100% 
= 100 x 7
= $700

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

100 u = 945

1 u = 945 ÷ 100 = 9.45

Spending in November
= 80 u
= 80 x 9.45
= $756

Total spending from September to November
= 700 + 945 + 756
= $2401

(b)
Increase in spending in November compared to September
= 756 - 700
= $56

Percentage increase
= ^{Increase in spending}_{Spending in September} x 100%
= ⁵⁶₇₀₀ x 100%
= 8%

Answer(s): (a) $2401; (b) 8%