During the Great Singapore Sale, Mr. Chen bought a digital camera for $810. This was 90% of the usual price How much was the discount

0.9x = 810

x = 900 original price

900 - 810 = _______ discount

To find out the discount amount, we need to know the usual price of the digital camera.

Let's assume "x" represents the usual price.

We know that Mr. Chen bought the camera for 90% of the usual price, which means he paid 90% of x.

So, we can set up the equation:

90% of x = $810

To solve for x, we divide both sides of the equation by 90%:

(x * 90%) / 90% = $810 / 90%

This simplifies to:

x = $900

Therefore, the usual price of the digital camera is $900.

To find the discount amount, we subtract the discounted price from the usual price:

Discount = Usual Price - Discounted Price
= $900 - $810
= $90

So, the discount for the digital camera is $90.