Linear mapping/Composition/Price/Salary/Exercise

Lucy Sonnenschein works as a bicycle messenger, she earns ${}12$ € per hour. At the fruit market, the price (per ${}100$ gram)

for raspberries is ${}3$ €, for strawberries the price is ${}2$ €, and for apples the price is ${}0,4$ €. Describe the mapping, which assigns to any purchase of fruits, the time, how long Lucy has to work for it, as a composition of linear mappings.

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