$ 9 Step-by-step explanation: Simple Interest = P.R.T / 100 P= Principal (Amount invested) =$30 R= Rate= 10% T= Time = 3 years Therefore, Simple Interest (1): I = PRT/100 1 = ($30 * 10 * 3 ) / 100 I = $900 / 100 1 = $9 She will have a total of $9 in three years