0.2% of what number is 6.4?

May 18, 2016

so 0.2% of 3200 = 6.4

Explanation:

Let the unknown be $x$

Then $\frac{0.2}{100} \times x = 6.4$

Multiply both sides by $\frac{100}{0.2}$

$\frac{0.2}{100} \times \frac{100}{0.2} \times x = 6.4 \times \frac{100}{0.2}$

$\frac{0.2}{0.2} \times \frac{100}{100} \times x = \frac{6.4}{0.2} \times 100$

$1 \times 1 \times x = 32 \times 100$

$x = 3200$