[填空题]
A farmer wants to build a rectangulaj;6d7.*z*xi vqa ;ransps e03o ,a eyhr enclosure for his chickv(wcs *utf i5(ih0.fu ens. The area of the enclosure c(u 0* fhfi.sit(wvu5must be 350 $\mathrm{~m}^{2}$ . The fencing used for the side A B costs \$ 13 per metre. The fencing for the other three sides costs $ 4 per metre. The farmer wants the cost of the enclosure to be a minimum. Find the minimum cost.
