Gary has 6 pounds of flour. He will use 4 pounds of flour to make cakes which require 0.5 pounds of flour each. The remaining 2 pounds of flour will be used to bake cupcakes, which require 1/5 pounds of flour. He plans to sell the cakes for $2.5 each and the cupcakes for $1 each in the school's bake sale. How much will Gary earn? Let's be accurate as possible.
Gary can bake 4 / 0.5 = 8 cakes from the 4 pounds of flour. He can bake 2 / 1 / 5 = 10 cupcakes from the 2 pounds of flour. So, he will earn $2.5 x 8 = $20 from the cakes. Hence, Gary will earn a total of $20 + $10 = $30 from baking 8 cakes and 10 cupcakes.
The answer: 30.