app.py

import gradio as gr

#calculation
def calculate (for_this,this_much,how_much_for_this):
    x = float(for_this)
    y = float(this_much)
    z = float(how_much_for_this)

    answer = (y/x)*z
    return answer

iface = gr.Interface(fn=calculate, inputs=["text", "text", "text"], outputs=["textbox"])
iface.launch()