Question

2. Cost of oil is increased by 6% everyday. What would be the cost after 3days, if today's cost is Rs 90.​

Answer 1

Answer:

• Cost of oil after 3 days will be ₹ 107.19

Step-by-step explanation:

Given that:

• Oil's present price = ₹ 90
• Cost of oil is increased by 6% everyday.

To find:

• Cost of oil after 3 days.

Formula Used:

$\sf{Amount=Principal\bigg(1+\dfrac{Rate}{100}\bigg)^{Time}}$

Where,

• Principal = ₹ 90
• Rate = 6%
• Time = 3 days

Substituting the values,

$\sf{A=90\bigg(1+\dfrac{6}{100}\bigg)^3}$

Adding 1 and 6/100,

$\longrightarrow\sf{90\bigg(\dfrac{100 + 6}{100}\bigg)^3}\\\\\longrightarrow\sf{90\bigg(\dfrac{106}{100}\bigg)^3}$

Opening the bracket,

$\longrightarrow\sf{90\times\dfrac{106}{100}\times\dfrac{106}{100}\times\dfrac{106}{100}}$

Cutting off the zeros,

$\longrightarrow\sf{9\!\!\!\not{0}\times\dfrac{106}{10\!\!\!\not{0}}\times\dfrac{106}{100}\times\dfrac{106}{100}}\\\\\longrightarrow\sf{9\times\dfrac{106}{10}\times\dfrac{106}{100}\times\dfrac{106}{100}}$

Multiplying the numbers,

$\sf{\dfrac{1,07,19,144}{100000}}$

Dividing the numbers,

$\sf{107.19}$

Hence, cost of oil after 3 days will be ₹ 107.19