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As he has to invest for a period of not more than 3 years. So he can invest in either shares or debentures. For maximum interest he should invest more money in Shares (as it has higher R × T ratio than that of debentures) So he invests Rs 10 lakh i.e the upper limit in shares and remaining amount in debentures. But the limit in debentures is Rs 6 lakh. So he can only invest Rs 16 lakh out of the total amount he has. Total interest on this Rs 16 lakh = 10L × 14 × 3/100 + 6L× 5 × 5/100 = Rs 420000 + Rs 150000 = Rs 570000
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