Sammi offered to sell to Nana her piano $3000. but Nana not enought money so that only can pay $1000. but after a week ,Nana win the gambling $2000. she write the letter to Sammi she wan buy the piano .but Sammi sell to Grace aredi.
1. Is it $1000 is counter offer?
2. is binding contract between sammi and nana?
3. Nana can sue sammin?