1. Nathan bought a bicycle for $230 at an auction. He fixed it up and sold it at a 30% markup. How much did Nathan sell the bike for?

If you are marking off a price that means you are ADDING to your final price because Nathan needs a profit for his bike. So to find the final price let’s add 30% of the original price to the final price by multiplying 230 by 0.30 which equals to 69 so then we add 69 to 230 which will be 299. So our final price is $299 dollars with the markup.