Compound Proportion

1. Jamuni and her friends are back home from the mela. When Jamuni visits her parents’ work site, she observes that a team of construction workers have constructed a wall 400 metres long in 12 days by working 8 hours everyday. How long will it take to construct a wall 600 metres in length if the workers put in 9 hours everyday?

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2. Jamuni’s mother deposited Rs. 4500 in a bank and received interest of Rs. 360 after two years. How much interest will she receive at the end of five years if she deposits Rs. 6000?

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