Let’s say W = 10 NBT, Q = $1, P’ = $2. That means R = 5 NBT. Since we know the prices, we know that 10 NSR were submitted and 20 NSR were received, giving the NSR version of R as -10 NSR. You can also get this by taking R and multiplying by -P’. The NSR version of R is just how much NSR the participant received for paying R NBT.
Stating R and P’ is sufficient to know how much NBT was sold at what price, which implies the cost.
