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elixir [45]
3 years ago
12

A textbook costs $58 and sells for $70. Find the rate of markup based on the selling price.

Mathematics
1 answer:
notka56 [123]3 years ago
7 0
58r=70

r=35/29

r≈1.2069

So the rate was about 1.21 or if you prefer about 20.7%
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\large\underline{\sf{Solution-}}

Given that,

A trapezium ABCD in which AB || CD such that

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\rm In \: \triangle  \: AOB  \: and \: \triangle \:  COD

\rm  \: \angle  \: AOB  \: and \: \angle \:  COD \:  \:  \{vertically \: opposite \: angles \}

\rm  \: \angle  \:ABO  \: and \: \angle \:  CDO \:  \:  \{alternate \: interior \: angles \}

\bf \: \triangle  \: AOB \:  \sim \:  \triangle  \: COD \:  \:  \:  \{AA \: similarity \}

\bf\longmapsto\:\dfrac{AO}{CO}  = \dfrac{BO}{DO}

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