To find the percent increase in the amount Calvin is putting into his savings account, you can use the following formula:
Percent Increase = [(New Amount - Old Amount) / Old Amount] * 100%
In this case:
Old Amount = $120
New Amount = $150
Percent Increase = [($150 - $120) / $120] * 100%
Percent Increase = [($30) / $120] * 100%
Percent Increase = (0.25) * 100%
Percent Increase = 25%
Calvin is increasing the amount he puts into his savings account by 25%.