Question

what expression represents the profit, and what is the profit if 240 cell phones are sold?

• $40x - 30$; $2,400$
• $40x - 30$; $9,570$
• $70x + 50$; $16,850$
• $70x + 50$; $28,800$

Explanation:

Step1: Test first expression with x=240

Substitute $x=240$ into $40x-30$:
$\$40(240) - 30 = 9600 - 30 = 9570$

Step2: Test second expression with x=240

Substitute $x=240$ into $70x+50$:
$\$70(240) + 50 = 16800 + 50 = 16850$

Step3: Match results to options

Compare calculated values to given option pairs.

Answer:

B. $40x - 30$; $\$9,570$