exam Maths Puzzle Numerical Ability

Dear teacher,

Can you please explain this to me? It is a formula for calculating dimishing depreciation of an asset.

Rate% = 100 x ( 1 - n√r/c ) x 100

n = life in y

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exam Other Question

Can you help me with this problem, i came up with two different answers.
2 over 5w+10 - 3 over 2w-4. I came up with 3/5 and 3/1 by figuring it two differnt ways. Would you please show me the correct way of working this problem. Thank you. If the sales tax rate is 2.5% and the tax on a purchase is $5, what was the amount of the purchase?

Can someone help me out with this?
Eddie