The Lombardo family went out to dinner and the cost of their meal was $62. If they left a 20% tip, how much did they leave?

2 Answers
Mar 17, 2018

The Lombardos left a tip of #$12.40#

Explanation:

If you know how to find #10%# of any number, you can use logic to find any other percent.

#10%# of any number is found by moving the decimal point one step smaller.

So #10%# of #$62# is #$6.20#

By logic, if #10%# is #$6.20#, then #20%# must be twice as much -- namely #$12.40#

Answer:
They left a tip of #$12.40#

Check

#20% "of"  $62# should equal #$12.40#

#color(white)(mml.)##$62#
#color(white)(m)## xx 0.20#
#color(white)(mm)#―――
#color(white)(mml)##124 0#

Put the decimal point in place
#$12.40#

#Check#

Mar 17, 2018

They left a $12.40 tip.

Explanation:

Discarding tax and any other surcharges (since none were specified,) we know that they left a tip of $12.40

To get this answer, first convert 20% to decimal form by replacing the percentage sign with a decimal point and moving it two places to the left

#20%# becomes #20.0# which becomes #.200#
Let this be known as #p#

Next, let #c# represent cost and #x# represent the tip (in dollars) left. Plug in the information to the equation #c*p = x#

#62*.20 = 12.40#