Elasticity co-efficient

Using both the percentage and the mid-point formula, what will be the elasticity co-efficient if you use the percentage formula and the midpoint formulas in calculating the following data: (1) Price falls from $3.00 to $2.70 and as a result, the quantity demanded rises from 1,000 to 1,200.Using both the percentage and the mid-point formula find the elasticity coefficient if price falls from $3.00 to $2.70, therefore the quantity demanded rises from 1,000 to 1,050.