MAMulti weight Index number

Hello sir I hope this massage finds you well Question : The managers of the catering division of a hospital wish to develop an index number series for measuring changes in food prices. As an experiment, they have chosen four items in general use which are summarised below Price per unit Quantities 2001 2002 2001 2002 Flour(kg) 0.25 0.03 8000 10000 Egg(box) 1.00 1.25 4000 5000 Milk(lit) 0.30 0.35 10000 10000 Potato kg 0.05 0.06 6000 10000 Calculate a weighted price index for 20X2 for these four products (with 20X1 as the base year) using the 20X1 sales quantities as weights. A. 118.3 B. 119.6 C. 119.9 D. 129.9 Sir in this is question I took the 2001 shopping basket( quantities ) and I calculate how much this shop basket cost for us in 2001 and 2002 prices Which in 2001 shopping basket cost us 9300 in 2001 prices And 2001 shopping basket cost us 11260 on 2002 prices Then 11260/9300 x 100 = 121 Could you please tell me sir which part of my calculation is wrong Thank you