translate English to French: Actual cost = [(BS) + (20% BS) + (13% BS) + (15% BS)], where BS stands for base-salary, 20 per cent accounts for benefits, 13 per cent accounts for accommodation and 15 per cent accounts for Core support services.
Coût réel = [(SB) + (20 % SB) + (13 % SB) + (15 % SB)], où SB est le salaire de base, 20 p. 100 représente les avantages sociaux, 13 p.