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A laptop has been marked up by 45% on cost and subsequently a 25% discount was given. if the discounted selling price was $3250 calculate the original cost of the laptop.

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Percentage - Please help I'm stuck!

Proof of Riemann Hypothesis

quadratic equation

Part (in %) of Prime numbers in set of natural numbers.

Proof of Riemann Hypothesis

quadratic equation

Part (in %) of Prime numbers in set of natural numbers.

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The website was created in September 2005.

It is visited by 14,000 - 28,000 people daily, mostly from USA, Bulgaria, Russia, India, Philippines, Ukraine, Serbia...

In 2011 was created a Russian version, and in 2015 Serbian.

It is visited by 14,000 - 28,000 people daily, mostly from USA, Bulgaria, Russia, India, Philippines, Ukraine, Serbia...

In 2011 was created a Russian version, and in 2015 Serbian.