Cost of goods sold for a company is $R30,00,000,R24,00,000$ and $R18,00,000$ for $2015,2014$ and $2013$ respectively. If

$2013$ is the base year the percentage increase in cost of goods sold from $2013$ to $2015$ is

A$.0\mathrm{.}7$

B$.0\mathrm{.}45$

C$.0\mathrm{.}6667$

D$.0\mathrm{.}5$