At a stationery shop it costs Rs 185 ...

At a stationery shop it costs Rs 185 for 4 gel-pens, 8 ball-point pens and one marker pen and Rs 315 for 7 gel-pens, 15 ball-point pens and one marker pen. Then what would be the cost of one gel-pen, one ball-point pen and one marker pen? (a) Rs 45 (b) Rs 55 (c) Rs 60 (d) Rs 70

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