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Answer:

Step-by-step explanation:

Question 1  :

  a) 4 / 5  as percentage

  ⇒ 4 / 5  * 100%

  ⇒ 400 / 5  %

  ⇒ 80 %

 b) 7 : 8 as percentage

   ⇒ 7 / 8   * 100 %

   ⇒ 700 / 8  %

   ⇒ 350 / 4 %

   ⇒ 175 / 2  %

   ⇒ 87.5 %

 c) 0.26 as percentage

   ⇒ 0.26  * 100%

   ⇒ 26 %

Question 2:

 6.3 % of x = 42

   ⇒ 6.3% of x = 42

   ⇒ ( 6.3 / 100 ) * x = 42

   ⇒ x = ( 100 * 42 ) / 6.3

   ⇒ x = 666.7 ( approx )

Question 3:

  EVERY year, price gets DECREASED by 10%. If its price is 38700, one year ago price would be something that got decreased by 10% and became 38700. LET that be a.

⇒ a - 10% of a = 38700

⇒ a - ( 10 / 100  * a ) = 38700

⇒ a - ( a / 10 ) = 38700

⇒ ( 10a - a ) / 10 = 38700

⇒ 9a = 38700 * 10

⇒ a = ( 38700 * 10 ) / 9

⇒ a =  43000


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