A sandwich and a cup of tea cost £2.10. Two sandwiches and a cup of tea cost £3.70.
Calculate the cost of a cup of tea. Show your working.
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Let's make sandwich "s" and tea "t."

Make an equation with the variables.

a. 1s + 1t = 2.10

b. 2s +1t = 3.70

Then, do 3.70-2.10, to find the cost of a sandwich. It equals 1.60.

Then, do 2.10-1.60 to find the cost of a cup of tea, which is 0.50.

SO: The cost of a cup of tea is £0.50.

The cost of a sandwich is £2.10.

Hope this helps!

the final amount you will pay is $68.04.

the tip is determined by the pre-tax amount, so we calculate the tip based on the original bill, not after we've added sales tax.

to find the tip:

we can divide 54.00 by 100 to get 1% of 54. then we multiply that by 18.

54 / 100 = .54

.54 x 18 = 9.72

tip = 9.72$

to find the tax:

we can divide 54.00 by 100 to get 1% of 54. then we can multiply that by 8 to get 8%.

54 / 100 = .54

.54 x 8 = 4.32

tax= 4.32

now we can add the tip and tax to the bill to get our total.

54 + 9.72 + 4.32 = 68.04

total: $68.04

step-by-step explanation: