How to write the equation out step by step

Question

You order two servings of pancakes and a fruit cup. The cost of the fruit cup is $1.50. You leave a 15% tip. Your total bill is $11.50. How much does one serving of pancakes cost?

 

Answer 1

C = cost of each serving of pancakes

 

(2C + 1.50)*1.15 = 11.50   .... the factor 1.15 accounts for the tip

 

2C + 1.5 = 10

2C = 8.5

C = 4.25