436. What is the cost of $15 \frac{13}{16}$ ells of material, if one ell costs 42 livres 17 sous 11 deniers?

Note. Livre - an ancient French coin; one livre $=20$ sous; 1 sou $=12$ deniers.
436. Answer: 678 livres 5 sous $9 \frac{11}{16}$ deniers.