The answer depends on what country the pennies and dollars belong to. There are very many countries whose main currency unit is the dollar and also many countries whose minor currency unit is a penny. The latter, for some bizarre reason includes the US which calls its cents pennies! Dumb!
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The ratio is 4:9
There are 100 pennies in 1 dollar, so 5,000 pennies makes 50 dollars.
4 pennies /100 pennies = 1/25
8 dollars cuz 100 pennies is $1 so 800 pennies is $8
Oh honey, 0.009 as a fraction is 9/1000. It's like trying to make a dollar out of pennies, but in this case, you're making a fraction out of decimals. Math can be a real hoot sometimes, can't it?