Problem

Ms. Yost has 20 boxes of markers. Next year, she plans to buy $420 \%$ more boxes. How many boxes will she have in all?

Answer

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Answer

Final Answer: Ms. Yost will have \(\boxed{104}\) boxes in all.

Steps

Step 1 ：Let's denote the number of original boxes as \(B_{original} = 20\)

Step 2 ：The percentage increase is 420%, which in decimal form is \(P_{increase} = 4.2\)

Step 3 ：We calculate the number of additional boxes as \(B_{additional} = B_{original} \times P_{increase} = 20 \times 4.2 = 84\)

Step 4 ：We then add the original number of boxes to the additional boxes to get the total number of boxes: \(B_{total} = B_{original} + B_{additional} = 20 + 84 = 104\)

Step 5 ：Final Answer: Ms. Yost will have \(\boxed{104}\) boxes in all.

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