Question 1:   Calculate: $10\%$  of  $10$

Question 2:   Calculate $25\%$  of  $8$

Question 3:   Calculate $40\%$  of  $50$

Question 4:   What percent of  $100$  is  $37$ ?

Question 5:   What percent of  $25$  is  $5$ ?

Question 6:   What percent of  $40$  is  $28$ ?

Question 7:   Price of goods increased from £$5$ to £$25$. What was the price increase?

Question 8:   Price of goods after $20\%$ price decrease is equal to £$16$ . What was the price before decrease?

Question 9:   Price of goods was increased by $20\%$ and then decreased by $20\%$ . What is the difference between the original price and the final price?

Question 10:   Price of goods was decreased by $20\%$. What price increase is required to return to the original price?