[American Quilter]

Forty-four percent (45%)

I've always thought it was redundant to add the numeric form in parentheses after the word form, but maybe not...

[Fantasywriter]

“I’ve always thought it was redundant to add the numeric form in parentheses after the word form, but maybe not... “

It’s done for emphasis. Like you might say, ‘Obama says he has visited fifty-seven (57!) states’.

It’s just an idiomatic way of saying, ‘Don’t miss this number!’.