Percentages, SM-Bank 077

A loaf of bread is on sale with a 15% discount.

In the last hour of trading, the bread is reduced a further 20% on the already discounted price.

What is the overall percentage discount on the bread? (2 marks)

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$32\%$

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$\text{Strategy 1}$

$\text{Assume the bread costs }$1.00.$

$\text{Cost after }15\text{% discount}=$0.85$

$\text{Cost after further }20\text{% discount}$	$= 0.85-(20\%\times 0.85)$
	$=0.85-0.17$
	$=$0.68$

$\therefore\ \text{Overall discount} =(1.00-0.68)\times 100 =32\text{%}$

$\text{Strategy 2}$

\(\text{Cost after further }20\text{% discount}\)	\(= 0.85-(20\%\times 0.85)\)
	\(=0.85-0.17\)
	\(=$0.68\)