Based on the profit that the fruit seller made from selling the watermelons, she bought a total of 87 watermelons.
The profit per watermelon is:
= 7 - 5
= 2 Ghana Cedis
If she made a profit of 150 Cedis in total, she must have sold:
= 150 / 2
= 75 watermelons
The total amount she bought was:
= 75 + 12 rotten ones
= 87 watermelons
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