exam Maths Puzzle Numerical Ability

investing planning/ the annual interest on Sid three investments amounted to $21,600 : 6% on a savings; 8% on mutual funds; 12% on bonds. If the amount of Sid's investment in bonds

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I tried to solve this problem in many ways, please help
problem (2.2^2)^3 =
my answer 2.2=4
(4^2)=16
16^3=4096
then
(2.2^2)^3
(4.2)
(8)^3
512
HOW DO YOU DIVIDE, MULTIPLY, AND CHANGE FRACTIONS INTO TERMINATING DECIMALS. HERE IS AND EXAMPLE OF THE PROBLEM I AM HAVING: 1 4/5 OR 2 33/1OO
ALSO HOW WOULD YOU TURN THEM INTO S