exam Maths Puzzle Numerical Ability

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?

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My teacher came up with this problem.
You must multiply the matrices.

[ 2 0 1] x [-2 3]

[-3 4 0] x [4 -1]

x [
i need to find the simple interest


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