Changing Note values of an entire score

Hello Folks

This is my first post on this forum. I recently transcribed a song for a homework. I made a mistake with the tempo. Instead of taking the real pulse that is 110 bpm, I've taken the pulse as the half (55 bpm), then I put the quarter notes as eigth notes, the eigth notes as sixteenth notes and so on. I have to correct my homework by setting the real tempo in 110 bpm but I don't want to re-write the entire song. Is there any way to double the value of all the notes at the same time and fix them in the measures? Thank you in advance.