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MGSM / Johnny took his allowance of 20andaddedanextra10 to it. He then invested…

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question

Johnny took his allowance of 20andaddedanextra20 and added an extra 10 to it. He then invested this sum of money, which tripled in a year. How much money did he have after a year?
Plain-text mathematical notation (without MathML)
Johnny took his allowance of 20andaddedanextra10 to it.  He then invested this sum of money, which tripled in a year.  How much money did he have after a year?
Original LaTeX notation
Johnny took his allowance of $20 and added an extra $10 to it.  He then invested this sum of money, which tripled in a year.  How much money did he have after a year?

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