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A sum is split into five equal parts. They are lent at annual rates of simple interests of 1%, 2%,3%, 10% and 5%. They are lent for 6 years, 4 years, 3 years, 1 year and 1 year, respectively. The simple interest on how many parts is at least 20% of the total interest?

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Solution :i) Let the TOTAL sum be Rs `5x`.
ii) FIND the interest on each part.
iii) Find the sum of the interest of 5 parts. Check which is GREATER than `20%` of the sum of INTERESTS.


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