to increase X by Y math.

[Katrika]

“to increase X by Y” – означает "Х умножить на Y" или "к Х прибавить Y"?

[The implicit tax rate on employed labour is defined as the sum of all direct and indirect taxes and employees' and employers' social contributions levied on employed labour income divided by the total compensation of employees working in the economic territory increased by taxes on wage bill and payroll.]

[SwetikS]

to increase X by Y = X+Y

to increase X Y times (or Y-fold) = X*Y

[Katrika]

Спасибо.