Nerissa writes five mathematics tests, each worth the same amount, and obtains an average of $73 \%$. After her teacher deletes one of her test marks, Nerissa's new average is $76 \%$. What was the mark on the test that the teacher deleted?
(A) $60 \%$
(B) $61 \%$
(C) $62 \%$
(D) $63 \%$
(E) $64 \%$
We can suppose that each test is worth 100 marks.

Since the average of her five test marks is $73 \%$, then the total number of marks that she received is $5 \times 73=365$.

Once her teacher removes a mark, her new average is $76 \%$ so the sum of the remaining four marks is $4 \times 76=304$.

Since $365-304=61$, then the mark removed was $61 \%$.

ANswer: (B)