$18.37 is the cost of just the dinner.
Add 6% of this as tax by either multiplying by dinner cost by 1.06 (to get dinner + tax)
For tip... If you calculate the 15% before, then you would add it together with the tax to get 21%, and then your answer would be calculated in the same way as just the tax.
If you tip the amount after tax, then take your answer for the (dinner + tax) part and use the same method, but with 15%.
(dinner + tax) x 1.15 = dinner, tax + tip
Answer:
$8.00
Step-by-step explanation:
cross multiply to get then divide by 25 and you will get
x=8
Answer:
750kmph
Step-by-step explanation:
Average is sum of all parts divided by the number of parts.
Let Stot be average speed for total trip (800kmph).
Let S1 be speed for first quarter of trip (950kmph).
Let S2, S3, and S4 be the speeds of each of the remaining quarters respectively.
Let Sans be the average speed for the remaining three quarters of the trip (a.k.a. The Answer!).
Stot = (S1 + S2 + S3 + S4) / 4
800kmph = (950kmph + S2 + S3 + S4) / 4
3200kmph = 950kmph + S2 + S3 + S4
3200kmph - 950kmph = 2250kmph = S2 + S3 + S4
Divide both sides by 3.
2250kmph / 3 = (S2 + S3 + S4) / 3 = Sans
Sans = 750kmph