Campus Maths Puzzle Numerical Ability Arithmetic

You have a total of 1000 cd's. 60% were sold at 50% discount
20% were sold at 30% discount and the remainder were sold at full price of $8.95. What was the approximate total revenue in dollars?

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Campus Other Question
MAP=P0MA then find the logic?????? There was a circle. A square of max size was cut from it. From this square, a circle of max size was cut. What
was the ratio of this final size w.r.t initial size?