GMAT Sentence Correction (SC) | Re: In 1973 mortgage payments represented twenty-one percent of

In 1973 mortgage payments represented twenty-one percent of an average thirty-year-old male's income; and forty-four percent in 1984.

In 1973………….
Mortgage payments represented twenty-one percent of an average thirty year-old male’s income;
And forty- four percent in 1984.

Two time scenarios (1973 and 1984)
Subject is mortgage payments.

1)A semi-colon is used to connect two independent clauses.
2)Comma+ FANBOYS is used to connect two independent clauses
•Here semi-colon+ FANBOYS
...

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