Zakaat on ingredients found in the home when doing home industry

Q: Consider a home business... Now and then I bake and sell some cakes etc. Please advise on zakaat. I don't have "stock" on hand...I only have ingredients, the product I am selling needs to be "made". 

1.Can I pay zakaat from my cash earnings only or do I have to calculate the value of any of my ingredients and pay as well? 

2. If I also have to pay on the value of any ingredients, how do I go about it? It will be very hard to calculate as I use these ingredients for my normal household use as well, it is only some of it that is used in the cakes I will sell.

Disposing of an English copy of the Quraan Majeed with only translation in it

Q: Please clarify for me, with regards to an English copy of the Quraan (translation only, no Arabic) Mufti had replied; 

1. There is consensus among leading ulama that the Quraan without the original text is impermissible and not at all correct. The right thing is to not use such a translation which does not have the original Arabic text. 

My question is, should I dispose of this copy of the Quraan? Can it be burnt? 

2. How do I dispose of Islamic writings and duas that have become yellowed with time?