Please help me to solve these questions. I have answers but do not know the solution.

Given the marginal tax information in the table below, indicate the after tax monthly income Aman should expect from his retirement income? Aman expects $14,060 annual income from the combination of his CPP and OAS and $14,000 from his RRIF.

Correct Answer:

2,091 1

Simplified Marginal Tax Table
Beginning of range		End of range	Tax at start of range	Marginal rate
-	to	12,000	-	0%
12,000	to	20,000	-	15%
20,000	to	48,000	1,200	22%
48,000	to	95,000	7,360	30%
95,000	to	148,000	21,460	40%
148,000	to	210,000	42,660	45%
210,000	+	above	70,560	50%