But by 1975 , basic four-function electronic calculators could be purchased for less than $ 50 .
But by 1975 , basic four-function electronic calculators could be purchased for under $ 50 .
But by 1975 , basic four-function electronic calculators could be purchased for under $ 50 .
بسط هذه الفقرة: But by 1975 , basic four-function electronic calculators could be purchased for less than $ 50 . خرج: