book Maths Puzzle Numerical Ability

During a sale,the price of a book is reduced by 25%. The sale price is then further reduced by 40%. The cost of the book as a percentage of the original price is?

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please tell me the proof for this question that Complex numbers and real Numbers are same numbers( I mean if we show complex numbres with C and real numbers with R we have : C~R ) what is the direct variation if y=5 when x=10 find y when x=1