A person of mass 20kg develops a power of 20W on climbing steps in 120s. If step is 0.2 high, find the number of steps.
\( \frac{20×0.2}{200×120}\)
\( \frac{20×200}{120×0.2}\)
\( \frac{20×120)}{200×0.2}\)
\( \frac{0.2×200}{20×120}\)
