Rate Problems

Rate problems use a known rate to find an amount, a time or a cost, so a hose that gives \(12\) L/min fills \(180\) L in \(15\) minutes. In NSW Year 8 maths this is where rates meet everyday money and household decisions (NESA outcome MA4‑RAT‑C‑01).

You will choose the right way round for the rule, match hours and minutes to the rate, and find unit prices per kilogram or per \(100\) g to pick the best buy, including items on special. You will work out pay from clock times, add the rates of two pumps or pipes working together, use a bill with two rates in its formula, and decide how many years an efficient fridge takes to pay back its extra cost. It is part of Year 8 Rates and Ratios.