I have a few business in mind and I am researching about opening a merchant account. It seems more professional and the cost will be a lot cheaper then paypal. My question is that I sell variety of products. From electronics to apparel to beauty products.

Should I apply for 1 merchant account or a few for each different business I am planning to start doing ?

Sales amount
Electronics - goes from $100-700
Apparel - goes from $15-$100
beauty products - goes from $15-500

You will most likely be fine with processing under single merchant account.

If you were offering dating service for instance along with the products you mentioned, it will be a big no, but in your case most processors should be able to accommodate you under one merchant id.

you can process under a single merchant account if you are selling all the products from the same store/website