Judging by stamps issued that year i would guess 8 cents, Canadian.
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On April first the postage rates jumped. domestic (0-1oz.) 17c. 1-2 oz. 27c. 3rd. class 0-2 oz. 15c.
The cost of a USPS stamp in 1975 depends on the time of the year. It was originally set to 10 cents on September 14th and then again raised on December 31st to 13 cents.
The cost of a first class stamp in 1975 was 10 cents. For a postcard it was 7 cents. Postcards went to 9 cents and First class went to 13 cents on December 31 1975.