Vincent invested her savings of $1,325 in a savings account that was earning simple interest at 3.25% p.a. She also invested $3,875 in her friend's business at 0.26% p.m.

a. What is the interest rate per month that is equivalent to 3.25% p.a.? % Round to two decimal places

b. What was the total interest earned from both investments at the end of 4 months?