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format ios string swift

How to add percent sign in string format?

I want to get string like "99.99%" from Double,and I used format to get this:

let rate = 99.99999
let str = String(format: "%.2f%", rate)
// output 99.99

And \% is not allowed. So how to add percent sign in string format, please help me!

write % twice:

rate = 99.99
let str = String(format: "%.2f%%", rate)