Jimi bought a vintage guitar for  
$
450
  from a music store. He spent several weeks fixing the guitar up and then sold it after adding a  
210
%
  markup to the original price. How much did he sell the guitar for?

To find out how much Jimi sold the guitar for, we need to calculate a 210% markup on the original price of $450. 

### Step-by-Step Solution:

1. **Original Price**: $450
2. **Markup Percentage**: 210%

To calculate the markup amount, we can use the formula:

\[
\text{Markup Amount} = \left( \frac{\text{Markup Percentage}}{100} \right) \times \text{Original Price}
\]

\[
\text{Markup Amount} = \left( \frac{210}{100} \right) \times 450 = 2.1 \times 450 = 945
\]

Now, to find the selling price:

\[
\text{Selling Price} = \text{Original Price} + \text{Markup Amount}
\]

\[
\text{Selling Price} = 450 + 945 = 1395
\]

### Final Answer:
Jimi sold the guitar for **$1,395**.

Would you like a more detailed breakdown, or do you have any other questions?

### Related Questions:
1. What is the formula for calculating a percentage markup or discount?
2. How would the selling price change if the markup was 150% instead?
3. What if Jimi had sold the guitar with a 25% discount after the markup—what would be the final price?
4. How does a markup affect profit margins in retail?
5. If the store bought the guitar from Jimi at a 10% markup, how much would the store pay him?

### Tip:
When dealing with percentage markups, always remember to add the original price to the markup to get the total selling price.

Jimi bought a vintage guitar for $450 from a music store. He spent several weeks fixing the guitar up and then sold it after adding a 210% markup to the original price. How much did he sell the guitar for?

Learn how to calculate the selling price of a vintage guitar with a 210% markup on an original price of $450. This step-by-step solution walks through percentage markup calculations, perfect for middle school math students in Grades 6-8.

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