Lena has decided to save money for a new skateboard that costs $150. Last week, Lena saved $12.64. Yesterday, Lena's grandmother gave her three times as much money as she saved last week to put toward the skateboard. Then, Lena used some of her saved money to buy an ice cream cone that costs $3.50. Calculate the amount Lena has saved so far and then write an expression showing the total amount Lena will have saved if she saves extra dollars, d, this week.