If 5% of the total number of cars sold of model E is 750, then what is the average number of cars sold of all the models ?

Total sales of E-type cars $=750 imes frac{100}{5}=15000$

$ecause 75^{circ} equiv 15000$

$herefore 360^{circ} equiv frac{15000}{75} imes 360=72000$

$herefore$ Required average $=frac{72000}{5}=14400$