Marc practiced guitar 25 minutes each day in July. In August, he practiced 60 minutes per day. Which is the percent increase in Marc's practice time from July to August?

140%

Step-by-step explanation:

From the question, we are informed that Marc practiced guitar 25 minutes each day in July while in August, he practiced 60 minutes per day.

The percent increase in Marc's practice time from July to August will be:

= (60 - 25) / 25 × 100

= 35/25 × 100

= 140%

step-by-step explanation: