You find the profit the trader made then subtract it from the total sos it’s
$144 x 0.2 = $28.8 (profit)
$144 - $28.8 = $115.2 (price of radio)
So the price of the radio is $115.20
The answer is D (1)Anna Atkins; (2) architects; (3)blueprints.
There you go hope this is what you wanted!