Question

Question is in the picture

Answer 1

Let, the smoothie without tip = x
After tip, = 110% of x
So, it would be = x * 1.10 = 2.75
x = 2.75 / 1.10
x = 2.50

In short, Your Answer would be $2.50

Hope this helps!

Answer 2

KEY: %/100=PART/WHOLE

SO,,,,,,,,,,,,,,,, 10/100=X/2.75
                       2,75 is in the bottom bwcause its the whole amount.
                       X is in the top because you dont know the tip/part

THEN,,,,,,,,,,,,,,,,,,,,, CROSS MULTIPLy..............    YOU GET 0.225.
THAT EQUALS THE TIP.............. SO YOU SUBRTACT 2.75-0.225 AND YOU ANSWER IS 2.525BUT YOU HAVE TO ROUND AND GET 2.53 AS YOUR ANSWER
HOPE IT HELPS :P