The arithmetic of growth
Keyword(s):
Every junior high-school teacher knows how hard it is to instill the concept: The same per cent of different amounts yields different answers. Twenty per cent of 50 is 10; but 20 per cent of 60 is 12.
1955 ◽
Vol 39
(210)
◽
pp. 158-161
Keyword(s):
1963 ◽
Vol 47
(285)
◽
pp. 44-48
◽
Keyword(s):
Keyword(s):
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