exam Maths Puzzle Numerical Ability

perform th eindicated operation . Express the answer in scientific notation. ( 5.6x 10^3) ( 4x10^5)

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Ellen Nancy borrowed $500 at 12% simple interest, to be repaid in 8 equal monthly installments of $70. If she pays off the loan when she makes her 4th payment, how much will she sa Pete won $10 000 in a lottery. He invested his winnings, part at 10% per annum and part at 11% per annum. If the total interest earned was %1060, how much was invested at each rate?