How many Hs in the compound below are replaced by Ds when it is shaken in D2O containing trace hydroxide? 
Definitions:
Cash Inflows
The total amount of money received by a company or individual during a set period.
Payback Period
The duration of time it takes to recover the cost of an investment, calculated as the point where net cash flow equals the initial investment.
Initial Cost
The initial expense associated with the purchase or investment in an asset before operational costs are considered.
Future Cash Inflows
Predicted incoming money to a company or project from operations, investments, or financing activities in the future.
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