Lucy invested $10,000 in a new mutual

, Magoosh Tutor

Clever solution! :D

Jul 15, 2014 • Reply

Vidyasagar Mohan Ram

Can we multiply all the multipliers and then find the total value ?

Sep 14, 2015 • Reply

Cydney Seigerman, Magoosh Tutor

Hi Vidyasagar :)

Great observation! Yes, because the order in which we multiply doesn't matter (this is the Commutative Property), we can find the final value by multiplying the product of the multipliers by the original value :)

In other words,

Final value = [product of multipliers]*[original value]

[(1.1)(1.05)(0.9)]*($10000) = $10395

Oct 17, 2015 • Reply

bilal muzaffar

bt Cydney Seigerman how to multiply all the decimal numbers without calculator, any simple way out?

Aug 28, 2016 • Reply

Cydney Seigerman, Magoosh Tutor

Hi Bilal,

While we can multiply the values in any order, that's not necessarily the best approach. It looks like Chitrabhanu provides a straight forward way to do the calculation efficiently. First they multiplied

1.1*0.9 = .99

then

1.05*10000 = 10500

leaving us with

0.99*10500

Instead of finding this product directly, it's a faster calculation if we recognize that the product is 0.01 (1%) less than 10500. One percent of 10500 = 105, so

0.99*10500 = 10500 - 105 = 10395

Hope this helps!

Aug 29, 2016 • Reply