Devi bought 7 skirts at $x, n skirts at $12 each, (2n+1) skirts at $15 each and 4 skirts at $3x each. Find the total cost of the skirts she bought.
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Total cost of skirts Devi bought
= 7× $x+nx S12+ (2n+1)× $15+4× $3x
= $7x + $12n + $15 (2n + 1) + $12x = $7x + $12n + $(30n +15) + $12r
= $(7x + 12n + 30m + 15 + 12x)
= S(7x + 12x + 12n + 30m+15)
= $(19x +42n + 15)
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