Emily is entering a bicycle race for charity. her mother play pledges $0.80 for every 0.75 mile she bikes. if emily bikes 12 miles, how much will her mother donate?

Emily bikes 12 miles, generating a donation unit for every 0.75 miles. Her 12 mile ride will generate
12 × 0.75 = 9 donation units. For each of these 9 danation units her mother will donate 80 cents.

It follows that Emily's mom will donate
9 donation units × $0.80 per unit = $7.20.

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