Chealsea and 2 friends went to the nail salon for manicures. Their subtotal was $85 and and they left a 12% tip. How much was their total bill including tip?

Total bill=$95.20

Step-by-step explanation:

Step 1: Determine the subtotal

Subtotal=$85

Step 2: Calculate the amount of the tip

Tip amount=12% of the subtotal

where;

subtotal=$85

replacing;

Tip amount = (12/100) * 85=10.20

The tip amount=$10.20

Step 3: Total bill

The total bill can be expressed as;

Total bill=tip amount+subtotal

where;

tip amount=$10.20

subtotal=$85

replacing;

Total bill = (85+10.20) = 95.20

Total bill=$95.20