duplicate of this post:
If you look at my answer in this post: Drag mouse release to trigger next scene - #9 by DBear ...you will see both questions above being answered. You will have to use Javascript because in the other post you mention that you want to transfer the amount to the next scene also. But, I show you a technique that reflects what I would do in this situation however it's not gonna be a plug and play solution if you have set up your document based on @michelangelo's solution above but you should be able follow the gist of it to get your amount to transfer over.
Be careful posting twice on the forums or if you are going to do it make everyone aware of what has been done before and share your document / workings so that we can tailor the solution a bit better to avoid confusion and back and forth.