Atoy store marks up wooden yoyos 50%. if the wholesale price of each yoyo is $2.20, what will be the price per yoyo at the cash register?

To find the price of the yoyo at the cash register, you will start with the wholesale price of $2.20 and increase it by 50%.  To calculate the final price after the markup, you will add 100% (all of the original price) to the 50% to get 150%.

150% of $2.20
1.5 x 2.2 = 3.3

The price at the register is $3.30.

21/2 or 5/2