Answer is 54% of chocolate cupcakes sold
Step by step
We know we have 162 chocolate cupcakes out of a total of 300 ( 162 + 138)
162 / 300 = 54% of chocolate cupcakes sold
Check your work
Find how many mocha cupcakes
138 / 300 = 46% of mocha cupcakes sold
46% + 54% = 100%