The easy way to ielts writing academic Module

As shown in the above examples, “percentage,” “proportion,”
and “rate” are accompanied by the definite article “the ” and
the preposition “of ” in most cases. However, if an adjective
defines these words, “the” changes to “a/an” accordingly.
This feature is quite similar to what was described previously
regarding “the number of” and “the amount of.”
For example
The percentage
of female employees vs. 
a
h
igh percentage
of
female employees
The proportion
of imported goods vs. 
an
e
normous proportion
of
imported goods
Approximation
It is crucial to use approximation vocabulary if the numbers and figures we
describe are not exact. For instance, if the figure is “39%”, we can round it
up using the vocabulary of approximation and describe it as “almost 40%”,
or in case the figure on the graph or chart is hard to read precisely, and it is
somewhat between 30% and 40%, we can use the vocabulary of

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approximation and refer to it as “roughly 35%”. The following sentences
show how to make use of the vocabulary of approximation:
For example
Approximately 10% of the population is over 75 years old.
Almost all students attended the session.
Around 40% of students passed the test.
About a quarter of the females in the program received a promotion.
Roughly half of the male candidates received approval.
Nearly 30% of people voted for the election.
Just below 20% of citizens were eligible for the application.
Just above 15% of students were qualified to pass.
Prepositions in describing trends
Using prepositions accurately plays a significant role in describing trends
and charts as the meanings conveyed could slightly differ with different
prepositions.