Book Maths Puzzle Numerical Ability

a salesman commission is 5% on all sales upto 10000 and 4% on all sales exceeding this. he emits rs. 31000 to his parent company after deducting his commission. find his total sales.

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Book Other Question

1+9+24+46+... A woman is walking down a downward-moving escalator and steps down 10steps to reach the bottom. Just as she reaches the bottom of the escalator, a sale commences on the floor above. She runs back up the downward moving escalator at a speed five times that which she walked down. She covers 25 steps in reaching the top. How many steps are visible on the escalator when it is switched off?