Multi item 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

2001 price per unit
Flour 0.25$ – egg 1$ – milk 0.3$ – potatoes 0.05$

2002 price per unit
Flour 0.03$ – egg 1.25$ – milk 0.35$ – potatoes 0.06$

2001 quantities
Flour 8000 kg – egg 4000 box – milk 10000 liter – potatoes 6000 kg

2002 quantities
Flour 10000 kg – egg 5000 box – milk 10000 liter – potatoes 10000 kg

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