app.py

import gradio as gr

def nascet (x,y):
    result = ((y-x)/y)*100
    return round (result,2)

iface = gr.Interface(fn=nascet, 
                     inputs= [gr.Number (label= 'Stenosis'), gr.Number (label= 'Normal')],
                     title= 'Nascet Calculator',
                     outputs= [gr.Number (label= 'Stenosis is ')])
iface.launch()