You are an industrial engineer at Energy Conservation Services, and you found that the anticipated profitability of a newly developed water-heater temperature-controlled device can be measured by present worth with the formula: NPW = 4.05X (2Y-$10) + (Z-50,000), where X is the number of units produced, Y is the sales price per unit, and Z is the cost basis.
The CEO of Energy Conservation Services mentioned that they made an initial investment (Z) of $125,000. The base values for X and Y are 4000 units and $15, respectively.

If the sales price per unit is increased by 20% above the base price, how much percent change in NPW can be expected?