35%
1) Gathering the data
bakery
mocha cupcakes =28
chocolate = 52
2) To find the percentage let's add them first and then set a proportion.
52+28= 80
Mocha cupcakes
Cupcakes
80---------------------------- 100%
28---------------------------- x
Cross multiply
80x = 2800 Divide them by 80
x=35
3) So 35% of the sold cupcakes were mocha cupcakes