Reserves $($R$)$: $100,000$ tuples stored in $1,000$ pages. There are $100$ boats. Each boat is equally poplar $($i$.$e$.,$ each has the same number of reservations$).$ Sailors $($S$)$: Stored in $500$ pages. There are $10$ distinct rating levels $(1$ to $10),$ each with the same number of sailors. We have $3$ memory pages. Find the join cost and the total cost using block nested join AND Index nested loop. Need a througly explanation including definitions and explain which each number is coming from.