How could you estimate a 20% tip for a $23.25 restaurant bill

I would round 23.25 up to 24, then double that to get 48, and finally move the decimal point 1 spot to the left to get 4.80

Note how 20% of 24 = 20/100*24 = 0.2*24 = 4.80

This is an overestimate of the actual tip which is...

20% of 23.25 = 0.2*23.25 = 4.65

The overestimate occurs because I rounded 23.25 up to 24. I rounded up because it is easier to deal with whole numbers. Also, you should round up (not down) to make sure you clear over the target hurdle.

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2