4. Tobin is required to purchase stationary for the office. A pack of A4 paper costs £2.99, a box of pencils costs 1.99 and a pack of ball tip pens costs £0.99. If Tobin is required to purchase 25 packs of A4 paper, 15 boxes of pencils and 20 packs of ball tip pens, how much money will remain unspent with a budget of £130?