While purchasing one item costing Rs. 400, I had to pay the sales tax at 7% and on smother costing Rs.6400, the sales tax was 9% . What percent of the sales tax . I had to pay taking the two items together on an average ?
Total sales tax paid = 7% of Rs. 400 + 9% of Rs. 6400
= Rs. `(7/100 xx 400 + 9/100 xx 6400)` = Rs. (28 + 576) = Rs. 604.
Total cost of the items = Rs.(400 + 6400) = Rs. 6800.
`:.` Required percentage = `(604/4800 xx 100)`% = `8 15/17`%.
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