Reverse percentages

           Reverse percentages

1.  Arham thinks his goldfish got chickenpox.  He lost 70% of his collection of goldfish. If he has 60

   survivors, how many did he have originally?

2. When heated an iron bar expands by 0.2%. If the increase in length is 1 cm, What is the original 

   length of the bar?

3. A one year old car is worth $11250. If its value had depreciated by 25% in that first year, calculate its price when new.

4. A sterio system is sold for $1998 and an 11% profit made. Find the original cost of the stereo.

5. A dealer gains5%  by selling a washing machine for $950. Find the original cost of the washing machine.

6. A dealer bought a second hand car and spent $650 on repairs. He made a profit of 20% by selling the car for $18 650. For how much did he purchase it?

7. By selling a set of Biology books for $408, the book seller suffers a loss of 4%. What was the cost price of the books?

8. A television has a sale price of $180. This is a saving of 25% on the original price. Find the original price.

9. A company increased its productivity by10% each year for the last two years. If it produced 56 265 units this year, how many units did it produce two years ago?

10. This year a farmer’s crop yielded 50 000 tonnes. If this represents a 25% increase on last year, what was the yield last year?