Suppose Acme Corporation has issued a bond with the following specifications:

The bond has a face value $($par value$)$ of $$1,000.$

There are $7$ years remaining until the bond matures.

The bond features an annual coupon rate of $4\%.$

Currently, the bond is being traded at a price of $$900.$

Your task is to calculate the bond's Yield to Maturity $($YTM$),$ which represents the internal rate of return $($IRR$)$ for an investor if the bond is held until it matures, considering its current market price, the annual coupon payments, and the redemption of its face value at maturity. The YTM is an essential metric for comparing the annual return between different bonds. Please submit the value as a percentage with two decimal places.