Question
Calculate Quantity Index number from the given data:



| Commodity | Base Year Qty.$(q0)$ | Current Year Qty. $(p1)$ |
| P | $170$ | $90$ |
| Q | $150$ | $70$ |
| R | $100$ | $75$ |
| S | $195$ | $150$ |
| T | $205$ | $95$ |
| $\sum p0 = 820$ | $\sum p1 = 480$ |
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