Explanation:
1. Nikki works at a store that sells consumer electronics. She earns $12 per hour, plus a commission of 5% of her total sales amount each day.
Nikki worked 8 hours on Saturday. Including her commission, Nikki earned a total of $139 on Saturday.
Which equation can be solved for x, Nikki’s total sales amount in dollars on Saturday?
C. 0.05x + 8(12) = 139
2. Kathy’s father thinks she spends too much time on the phone. He wants to see how much time she spent talking last month, but he does not have the phone bill; he has only his checkbook, which tells him that her bill last month was $110. The phone company charges a monthly base fee of $50, plus ten cents per minute. How many minutes did Kathy spend on the phone last month?
0.10x + 50 = 110
subtract 50 from both sides:
0.10x + 50 - 50 = 110 - 50
0.10x = 60
divide both sides by 0.10:
0.10x/0.10 = 60/0.10
x = 600
B. 600 minutes