After a 20% increase, the new price of a radio is $78.00. What was the original price of the radio?
Stacey Warren - Expert brainly.com
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adila ..please do not just give answers
If the radio is $78.00 after a 20% increase, then this means that $78.00 is 120% of some number. So if you can figure out that calculation, you're golden.
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The easiest way to do this is by trial and error ..psymon was completely correct a way you can check is take each answer and multiply by 1.2 ...if one is 78 that will be right
ok, great. Let me try to solve it. :) @Psymon
Yeah, sure, try to solve it and lets see what you get ^_^
And trial and error is not needed : )
well its a pretty simple way :P
If you think you got down the method of solving it real well then awesome. Otherwise I can show you how I do it :3
I got 62.4 but I don't think I did it right. :/
Yeah, it shouldnt bethat.
isnt it 65?
So I have a unique way of thinking of it. I do what I would say is a verbal proportion, meaning I put down the numbers based on how I read the sentence. So this is how I set it up:
So let's phrase our question. "78 is 120% of what number?" This is essentially what we're solving. So as I read this "78 is", well, that would be the number I put under "is" in my proportion. Of course 120 fills in the percent category. And "of what number" means I do not know what to put in the of part of my proportion. The 100 on the bottom right always stays there. So that being said, I can plug in all of my numbers and then solve for x by cross-multiplying like so:
Haha, flower, clever xDD
u did all the work so figured i would contribute something artsy :D
haha! Thank you so much to both of you. You both made it so clear. I really appreciate it! :)