Question: to purchase gold actually deliver or floating contract ?
Answer: agreement to deliver gold and pay in full price.

Question: where did the shop determine the price from?
Answer: golden trade association.

Question: gold 99.99% and 96.5% how is different? And investment in Thailand fond of 99.99 or 96.5% gold?
Answer: different in value of pure gold and price, because 99.99% has more purity than 96.5% which will be more expensive, in investment of gold in Thailand like 96.5% gold.

Question: bar gold if customer has profit from transaction do they be claimed tax from Revenue department?
Answer: no, because bar gold is movable asset as cars, so they will not claim for taxes.