Maruf's net income is always 80 percent of his gross income. What will be increase in Maruf's net income when his gross income increases from Tk. 20,000 to Tk. 30,000?
A
5,000
B
6,000
C
8,000
D
none of these
Correct Answer: 8,000
Net income from gross income of 20,000 tk = 80% of 20,000 = (0.8)(20,000) Net income from gross income of 30,000 tk = 80% of 30,000 = (0.8)(30,000) So, the INCREASE in net income = (0.8)(30,000) - (0.8)(20,000) = (0.8)(30,000 - 20,000) = (0.8)(10,000) = 8,000 tk. Ans