How much wheat is exported every year /

Wheat is exported by:

A bag of wheat weighs 97.8 kg. How much wheat is contained in 500 such bags?

A heat engine is 20% efficient. If the engine does 500 J of work every second, how much heat does the engine exhaust every second ?

Study the following graph carefully and answer the questions that If the production in year 1998 was 1000 units , how much was the production in year 2002 ?

Mr Bhaskar saves Rs. 8756 every month. How much money will he save in 13 years ?