i think i will gamble it 
and i know that i will succeed and double my 100,000 dollars 
and i will become rich as well hahaha
Maybe it would work for you but your answer does not fit with the topic on how to double your money safely. and i know that i will succeed and double my 100,000 dollars and i will become rich as well hahahaGambling is all about taking risk if you want to double your money and most of the time the gamblers loses when he aims for the money because gambling sites are design to suck our money due to their advantage.