Solution — 2022 Question 1 Simultaneous Linear Equations

Let $P,Q$ and $R$ represent the cost of one Type $P,Q$ and $R$ radio respectively

Solving equations (1), (2) and (3) with a GC,

$$P=36.60,Q=27.45,R=45.80$$

$$\text{Cost of one Type }R\text{ radio}=\$45.80∎$$