2.1.1 Write down a function representing the unit price,

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2.1.1 Write down a function representing the unit price,

Let $n$ be the number of units ordered.
The original price per unit is R30.
The unit price decreases by R0.05 for each unit ordered beyond 80.
So, if $n > 80$, the number of units beyond 80 is $(n - 80)$.
The total decrease in unit price is $0.05 \times (n - 80)$.
The new unit price, $P(n)$, is $30 - 0.05(n - 80)$.
Let's simplify this expression:
$P(n) = 30 -