Question

if the price of the cooking gas rises by 15% by what percent should a family reduce it's consumption so as not to exceed the budget on cooking gas
a) 12 1/3 %
B) 13 1/23 %
C) 14 1/23 %
D) -15%​

Answer 1

Answer:

D)-15%

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Answer 2

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• If the price of the cooking gas rises by 15%, by what %, should family reduce its consumption so as not to exceed the budget on cooking?

$\huge\boxed{\fcolorbox{purple}{ink}{GIVEN:}}$

The price of the cooking gas rises by 15%

$\huge\fbox\pink{✯Formula Used:✯}$

• New cost price = Old cost price × (100 + increase %)/100

• Consumption reduce = [(New cost price – Old cost price)/New cost price] × 100

$\huge\fbox\pink{✯Calculation:✯}$

• Let the cost price of the cooking gas be 100.

• New cost price of the cooking gas = 100 × (100 + 15)/100

$⇒ 115$

• Consumption reduce = [(New cost price – Old cost price)/New cost price] × 100

$⇒ [(115 – 100)/115] × 100 \\⇒ 1500/115 \\⇒ 300/23 \\ = 13 \frac{1}{23}\%$

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option b) is correct