MHB Maximizing Profit: Solving a Quadratic Equation for Mango Sales

paulmdrdo1
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Please help me continue this problem

A market vendor bought a crate of mangoes for 55 peso. when the crate was opened he found that 4 pieces were not fit to be sold. If he sells the rest at 80 cents more than the buying price, he gets a profit of 8 peso for these remaining mangoes. How many mangoes were in the crate?

The only thing I know is

$\left(\frac{55}{x}+0.8\right)(x-4)=??$

I'm stuck! :(
 
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If his cost is 55 pesos, and his profit is 8 pesos, what is the total selling price in all?
 

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