Answer:
$29.2
Explanation:
Step 1
Buying price=$84
Selling price=$130
Gross profit=Selling price-Buying price
Gross profit=$130-$84=$46
Step 2
Overhead =20% of buying price
Overhead=\frac {20}{100}*84=$16.8
Net profit=Gross profit-Overhead
Net profit=$46-$16.8=$29.2
Therefore, Mr. Johnson's net profit on the desk is $29.2
Ans=$29.2