A company has 300 items to post, they have packages and letters in the ratio 16 : 59. Of these letters 1/4 was 1st class,
and the rest were 2nd class.
Package cost £1.20
1st class letter
cost

52p

2nd class letter
cost

31p

How much would it cost the company to send their post?

£162.35.

Step-by-step explanation:

Total of letters + packages = 300.

Number of packages =  300 * 16 / ( 16+59)

= 300 * 16/75

= 64

So number of letters = 300 - 64 = 236.

No. of first class letters = 236 * 1/4 = 59.

No. of 2nd class letters = 236 - 59 = 177.

Total cost

=  64*1.2 + 0.52*59 + 0.31*177

= 162.35.

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