Change input value onclick button - pure javascript or jQuery

Question

I have two buttons and if I click on some button I need to change value in input text and change total price (product price * value of button - 2 or 4 Qty).

I know

Answer 1

Try This(Simple javascript):-

 
    
       
       
          Product price: $500
          

          
Total price: $500 
          

          
          
          

          Total 
       
    

Hope this will help you..