Mathematics for IGCSE & O level - Proportion (Section 1 - No. 13)
Which scenario describes direct proportion?
The time taken to complete a journey and the speed of travel.
The number of workers and the time it takes to build a house.
The number of products sold and the total revenue earned.
The price of an item and the quantity of that item you can buy with a fixed amount of money.
Giải thích
Direct proportion means both variables increase or decrease proportionally. Revenue increases as sales increase.