exam Maths Puzzle Numerical Ability

i need to find the simple interest

prinipal: $21,ooo
rate:5.25%
time: 18 years
thanks for helping

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exam Other Question

If there are 6 x10^9 people on the Earth and there is enough freshwater to provide each person with 8.79 x10^5 L, how much freshwater is on the Earth? Use the formula C= 5/9 (F-32 degrees) to find the Celsius temperature that is equivalent to the 59 degrees Fahrenheit.