Tyler’s brother works in a shoe store.

1. Tyler’s brother earns a commission. He makes 2.5% of the amount he sells. Last week, he sold $900 worth of shoes. How much was his commission?
2. The store bought a pair of shoes for $50, and sold it for $80. What percentage was the markup?
3. Tyler’s brother earns $12 per hour. The store offers him a raise—a 5% increase per hour. After the raise, how much will Tyler’s brother make per hour?

1. Tyler's brother earns a commission of 2.5% of the amount he sells. So his commission would be 2.5/100 * $900 = $<<2.5/100*900=22.5>>22.5.

2. The store bought a pair of shoes for $50 and sold it for $80. The markup is the difference between the selling price and the cost price, which is $80 - $50 = $<<80-50=30>>30.
To calculate the markup percentage, we divide the markup by the cost price and multiply by 100: ($30/$50) * 100 = 60%. Therefore, the markup was 60%.

3. Tyler's brother earns $12 per hour and receives a 5% raise per hour. To calculate his new wage, we multiply $12 by 5/100, which is $12 * (5/100) = $0.6.
So his new hourly wage will be $12 + $0.6 = $<<12+0.6=12.60>>12.60 per hour.