If the selling price of 16 water bottles is equal to the cost price of 17 water bottles, find the gain per cent earned by the dealer.
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Let the selling price of each bottle be y.
Let the cost price of each bottle be x.
According to the question,
16y=17x
⟹
x
y
=
16
17
Gain %=(
x
y
−1)×100
⟹Gain %=(
16
17
−1)×100=6.25%
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