Music store marks up the instruments it sells by 30%. If the store bought a guitar for $45, what will be its store price?
If the price tag on a trumpet says $104, how much did the store pay for it?
If the store paid $75 for a clarinet and sold it for $100, did the store mark up the price by 30%?

$58.50

$80

No

Step-by-step explanation:

A:  30% of $45 means we must multiply 0.30 and 45. $45 x 0.30 = $13.50 is the markup. Next, add $13.50 to $45 for a total of $58.50 to get the total amount the store will charge with the markup.  

B:   X = price the STORE pays for instr.

130% X   = $ 104

X = 104/(130%) = 104/1.3 = $ 80

No, It would have went up by 25% because 100%-25%=75%

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb

the radius is 2 times the diameter.

step-by-step explanation: