Question

in certain country families with anet incame of over 18000 birr must pey an incame tax of 3000 birr plus 30% of the amount over 18000 birr what is the range of the net income of families who pay an income tax between 3483 birr &4050 birr?

Answer 1

Let i be the income, and t be the amount of taxes
t = 3000 + .3(i - 1800)

if t = 3483, then 3483 = 3000 + .3(i - 1800)
.3(i - 1800) = 483
i - 1800 = 1610
i = 3410 <------ income for lower tax paid.

if t = 4050 .......

do the second income the same way, and you got your range.

Answer 2

Boba