Given:
Income made last year = $30,000
Tax rate for the first $7000 = 15% = 0.15
Tax rate for the amount over $7000 = 18% = 0.18
Let's find the amount Linda must pay in income tax last year.
To find the amount she must pay, we have:
Tax for first $7000 = 0.15 x 7000 = $1050
Tax for amount over $7000 = 0.18 x (30000 - 7000)
= 0.18 x 23000 = $4140
Therefore, the amount she must pay in income tax is:
T = $1050 + $4140 = $5,190
Linda must pay $5,190 in income tax for last year.
ANSWER:
$5,190