3. What single discount is equivalent to two
successive discounts of 25% and 5%?
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R = 25
r = 5
So, [ R + r - R * r ]
100
= [ 25 + 5 - 25 * 5 ]
100
= [ 30 - 5 ]
4
= [ 120 - 5]
4
= [ 115 ] = 28.75%
4
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