A stationery shop sells pens and notebooks. A pen costs $p$ cents, and a notebook costs $n$ cents.
(a)[1]
Complete the equation by writing the missing value: $5p+4n=\,\ldots$
(b)[2]
Write this information in equation form.
(c)[3]
Solve the two equations to find the cost of a pen and the cost of a notebook. You must show every step of your working.
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