$.$ The total project cost is $$12W,000$ while the earning is based on the percentage of the actual work that

has been completed. The payment from the client will only be received one month after the completion

of the work.

$.$ Material spending is based on the percentage of the planned work completed. With the total

material cost of $$3Y,000,$ the supplier has agreed on accepting a two month credits payment term.

$.$ The salary of one engineer is at $$2,500$ per month, while each of the $5$ workers is getting $$1x00$ per

month. The salary should be paid on the same month.

$.$ Both of the utility and loan cost $$5,Z00$ per month, which also need to be settled on the same month.

$(15$ marks$)$

w$=1$

x$=0$

y$=2$

z$=5$