Answer:
To calculate the new retail price of the desk lamp after a markup of 80%, we need to add 80% of the original price to the original price itself.
The original price of the desk lamp is $35. To find 80% of $35, we multiply $35 by 0.8:
80% * $35 = $28
Now, we add this amount to the original price:
$35 + $28 = $63
Therefore, the new retail price of the desk lamp after an 80% markup is $63.
Explanation: