exam Maths Puzzle Numerical Ability

evaluate and simplify:
SQRT of 3(8 SQRT of 7- 4 SQRT of 3)

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exam Other Question

2. A business invests $10,000 in a savings account for two years. At the beginning of the second year, an additional $3500 is invested. At the end of the second year, the account balance is $15,569.75. What was the annual interest rate? I tried to do this three times, but get lost in all the steps. Can you help me?

C(10,5)x C(15,8)
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C(12,11)