How to compute Discount using Java? (Code please) Thankss!

Answer 1

Exactly as in normal maths:
20% discount on €500

public float discount(float cost, float discount)
{ //500:x=100:20
return cost*discount/100;
}

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Answer 2

In mathematics, a percentage is a number or ratio expressed as a fraction of 100. So it must be represented by floating point data type double not float, because here the accuracy is very important.

The basic way to calculate a discount is to multiply the original price by the decimal form of the percentage.

price *= (1 - discount_percentage)

double updatePrice(double price, double discount) {
return price*(1-discount);
}