Tommy's and Shannon's monthly allowances were the same at first. Tommy's allowance increased by 25% while Shannon's decreased by 15%. Given that Tommy's allowance would increase by another 40% if he had received $1115 more from his Parents, find the difference in the children's monthly allowances.

	Tommy	Shannon
Before	1 u	1 u
Change 1	+ 0.25 u	- 0.15 u
After 1	1.25 u	0.85 u
Change 2	+ 0.5 u	No change
After 2	1.75 u	0.85 u

Increase in Tommy's allowance
= 25% x 1 u
= ²⁵₁₀₀ x 1 u
= 0.25 u

Decrease in Shannon's allowance
= 15% x 1 u
= ¹⁵₁₀₀ x 1 u
= 0.15 u

Increase in Tommy's allowance if his Parents gave another $1115
= 40% x 1.25 u
= ⁴⁰₁₀₀ x 1.25 u
= 0.5 u

0.5 u = 1115

1 u = 1115 ÷ 0.5 = 2230

Difference in the allowance between Tommy and Shannon
= 1.25 u - 0.85 u
= 0.4 u
= 0.4 x 2230
= $892

Answer(s): $892