A store is selling an MP3 player for 20off The sale price is

A store is selling an MP3 player for 20%off. The sale price is $192. What is the original price? a.$212 b.$240 c.$230.40 d.$135.60 e. none of these an invested some money at 5%simple interest, and $1000 more than twice that amount at 6%simple interest. At the end of the year Ann earned a total of$264 in interest. How mu C h money did Ann invest at 5percentage?

Solution

(1)

We are given that

discount=20%=0.20

sale price =%192

Let\'s assume original price=x

so, we get

sale price = (1-0.20)*original price

192=0.80*x

now, we can solve for \'x\'

x=240

original price =$240........Answer

(2)

Let\'s assume \'x\' be amount invested when interest rate =5%

now, we find amount invested when interest rate =6% is (1000+2x)

now, we are given total interest amount =264

so, we will get

264=x*0.05+(1000+2x)*0.06.............Answer

now, we can simplify it

264=0.05x+60+0.12x

204=0.17x

x=12