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

1 thought on “2. Cost of oil is increased by 6% everyday. What would be the cost after 3days, if today’s cost is Rs 90.​”

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:

   [tex]\sf{Amount=Principal\bigg(1+\dfrac{Rate}{100}\bigg)^{Time}}[/tex]

   Where,

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

   Substituting the values,

   [tex]\sf{A=90\bigg(1+\dfrac{6}{100}\bigg)^3}[/tex]

   Adding 1 and 6/100,

   [tex]\longrightarrow\sf{90\bigg(\dfrac{100 + 6}{100}\bigg)^3}\\\\\longrightarrow\sf{90\bigg(\dfrac{106}{100}\bigg)^3}[/tex]

   Opening the bracket,

   [tex]\longrightarrow\sf{90\times\dfrac{106}{100}\times\dfrac{106}{100}\times\dfrac{106}{100}}[/tex]

   Cutting off the zeros,

   [tex]\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}}[/tex]

   Multiplying the numbers,

   [tex]\sf{\dfrac{1,07,19,144}{100000}}[/tex]

   Dividing the numbers,

   [tex]\sf{107.19}[/tex]

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

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