An eraser

The cost of an eraser is $ 0.80 and the cost of a pencil is $ 2. What is the ratio of their costs in simplest form?

Correct answer:

r =  2:5

Step-by-step explanation:

a=10080=54=0.8 USD b=2 USD  r=a:b=0.8:2=2:5=52=0.4



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