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An Index of retail prices is the mean of...

An Index of retail prices is the mean of the five other price index numbers which are weighted as follows:

The original index of retail prices are established at 100. If the following percentage increases in the various indices have occurred since that time, find the index of retail prices now.
`A=55% , B= 180%, C=60%, D=45%, E=90%`.

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The correct Answer is:
`=179.635`.
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