Arithmetic on today's supply, not a forecast. It assumes nothing about whether Rain could attract that much money.
A coin's market capitalisation is its price multiplied by the number of coins in circulation. Rain has 708,526,321,704 RAIN in circulation at $0.015769 each, which is $11.17B. Holding that supply still and putting Zcash's $19.29B in its place gives $0.0272238 per RAIN.
The two are close in size, so the answer is a 1.73x move. Rain and Zcash are within a factor of two of each other by market capitalisation.
Supply is held still, and in practice it moves: coins are minted, burned and unlocked, and every one of those changes the price a given market capitalisation implies. The figure also says nothing about whether the money exists to buy RAIN at that level, which is the part that actually decides a price.
$0.0272238 per RAIN. That is Zcash's current market capitalisation of $19.29B divided across the 708,526,321,704 RAIN in circulation.
1.73x. Rain trades at $0.015769 today and Zcash's market cap is $19.29B against Rain's $11.17B.
No. It is one division: Zcash's market capitalisation spread over the supply of RAIN that exists today. It assumes nothing about whether Rain could attract that much money, and it holds the supply still when in practice supply changes.
It sets it. Market cap is price times circulating supply, so the same $19.29B of market cap spread over more coins gives a lower price per coin. This uses the 708,526,321,704 RAIN in circulation now.