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.