Solve 90-50%-20%

$$90-50 \% -20 \%$$

Evaluate

$$\frac{893}{10}=89.3$$

Solution Steps

Reduce the fraction \frac{50}{100} to lowest terms by extracting and canceling out 50.

$$90-\frac{1}{2}-\frac{20}{100}$$

Convert 90 to fraction \frac{180}{2}.

$$\frac{180}{2}-\frac{1}{2}-\frac{20}{100}$$

Since \frac{180}{2} and \frac{1}{2} have the same denominator, subtract them by subtracting their numerators.

$$\frac{180-1}{2}-\frac{20}{100}$$

Subtract 1 from 180 to get 179.

$$\frac{179}{2}-\frac{20}{100}$$

Reduce the fraction \frac{20}{100} to lowest terms by extracting and canceling out 20.

$$\frac{179}{2}-\frac{1}{5}$$

Least common multiple of 2 and 5 is 10. Convert \frac{179}{2} and \frac{1}{5} to fractions with denominator 10.

$$\frac{895}{10}-\frac{2}{10}$$

Since \frac{895}{10} and \frac{2}{10} have the same denominator, subtract them by subtracting their numerators.

$$\frac{895-2}{10}$$

Subtract 2 from 895 to get 893.

$$\frac{893}{10}$$

Factor

$$\frac{19 \cdot 47}{2 \cdot 5} = 89\frac{3}{10} = 89.3$$