68. Oblicz, o ile promili liczba b jest większa od liczby a, jeżeli:
a) a = 8, b = 8,008 c) a = 13,215, b = 13,218
b) a = 7, b = 7,7 d) a = 1253,3, b = 1253,57
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a) 8 - 1000‰
8,008 - x
x=(8,008*1000)/8=1001‰
Odp. O 1‰
b)13,215-1000‰
13,218- x
x=1000,23‰
Odp. O 0,23‰.
c)7-1000‰
7,7-x
x=1100‰
Odp. o 100‰
d)1253,3 - 1000‰
1253,57-x
x=1000,25‰
Odp. O 0,25‰