Answer:
398-cent of stamp for postage.
Explanation:
For one letter, Travis needs a stamp of 37-cent.
For four letters, Travis needs stamps of (37*4 letters) = 148-cent.
Again,
For one postcard, Travis needs a stamp of 25-cent
For ten postcards, Travis needs stamps of (25*10 postcards) = 250-cent
Therefore, Travis will spend stamp for postage = (148-cent + 250-cent) = 398-cent or $3.98 cent.