Desk cost $349.50 once delivered invoice reflects $387.22. If tax is 7.5% how much was the shipping charge?

Shipping charge was $11.51

Step-by-step explanation:

(1.075) ($349.50) = $375.71 (cost of desk, with tax, without shipping)

Subtracting this amount from the total paid, $387.22, we get $11.51 as the shipping charge.

Check: Does $349.50 + $11.51 + $24.47 = $387.22? Yes