David spent ⁴₇ of his salary and gave $588 to his wife. Of the remaining amount, he saved ¹₄ of it and gave ⁴₉ of it to his grandparents. He then donated ²₃ of what he had left away and gave the remaining $45 to his son. What was David's salary?

Spent	Wife	Saved	Grandparents	Donated	Son	Total
4 u	3 u					7 u
	$588	1 p	3 p
			4x3	5x3
				2x5	1x5
			12 b	10 b	5 b $45

Amount that his son received = 5 b

5 b = 45
1 b = 45 ÷ 5 = 9

Amount of his salary given to his grandparents, his donations and his son
= 12 b + 10 b + 5 b
= 27 b
= 27 x 9
= $243

3 p = 243 
1 p = 243 ÷ 3 = 81

Amount of his salary given to his savings, his grandparents, his donations and his son
= 1 p + 3 p
= 4 p
= 4 x 81
= $324

Amount of his salary given to his wife, his savings, his grandparents, his donations and his son
= 588 + 324
= $912 

3 u = 912 
1 u = 912 ÷ 3 = 304

David's salary
= 7 u
= 7 x 304
= $2128

Answer(s): $2128