Mathematics for IGCSE & O level - Ratio And Proportion (Section 6 - No. 23)
A shop makes a profit of $1800 in 3 months. Assuming the profit is proportional to time, what profit does the shop make in a year?
$3600
$4800
$7200
$9600
Vysvětlení
1 year = 12 months. Profit in a year = (12/3) * $1800 = $7200