book Maths Puzzle Numerical Ability

Write the following numbers in expanded form.
123 base5

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Hi.
I need help on solving systems of equations using augmented matrix method. The systems are: x + y + z = -2, 2x - 3y + z = -11, -x + 2y - z = 8. Thank you very much for your ti If selling price is doubled ,profit is tripled then find the profit % or loss %.