at a certain stationery store,only 4 varieties of pens and only 4 varieties of pencils are sold.the price of a set of one of each of the 4 varieties of pens is rupees 45.the price of a set of one of each of the 4 varieties of pencils is rupees 12.the price of cheapest pencil is rupee 1 and the combined price of 3 of the varieties of pens are exactly twice the combined price of the other 3 varieties of pencils.what is the price of the costliest variety of pen?pl. provide sol.

1) 24
2) 23
3) 22
4) 25