A sum of $2000$ is invested for $2$ years at $10%$ per year, compounded annually. The final amount is:

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What is the least common multiple of $12$ , $18$ and $30$ ?
A price rises by $20%$ and the new price then falls by $20%$ . Compared with the original price, the final price is:
If $A : B = 3 : 5$ and $B : C = 2 : 3$ , and $C = 45$ , what is $A$ ?
A car travels $120$ km at $60$ km/h and then another $120$ km at $40$ km/h. Its average speed for the whole trip is:
Pipe $A$ fills a tank in $12$ hours, pipe $B$ fills it in $24$ hours and drain $C$ empties it in $36$ hours. With all three open, the tank f…
$20$ L of a $30%$ alcohol solution is mixed with $10$ L of pure water. The alcohol concentration of the mixture is: