You need help with the following problem
You are buying disk space for your company. Vendor "Sally" is willing to sell 1 yotta byte for 1 peta "it" coins. Vendor "Sandy" is willing to sell 1 exa byte for 1 tera "it" coins. Who is giving you the better deal?
Express each deal in prefix, explict and Exponential (ie. Scientific) notation as a cost per byte and per bit.