hey,
if 40% of the total price of graphing calculator is $30,
then, let the total price of calculator be assumed 'x'.
40/100 × 'x' = 30
'x' = 30 × 100/40
'x' = 30 × 10/4
'x' = 7.5 × 10
'x' = 75
so mate, the price of graphing calculator is $ 75.
mark me as brainlest...
