3.5 Leon runs a retail grocery business, dealing in luxury and delicatessen goods. In 2012 revenue was £295 993, with cost of sales at £242 085. The equivalent figures for 2011 were revenue of £287 300 and cost of sales of £235 920.

Calculate:

i. Leon’s gross profit margin in both years.

ii. The increase in revenue.

iii. The percentage increase in revenue.

iv. The increase in gross profit.

v. The percentage increase in gross profit.