i need full and correct solution of this question

Good Neighbor Fencing (GNF) buys lumber from Henniker Lumberyard. It separately hires Bedford Trucking to move lumber from the lumber yard to GNF's facility. Bedford Trucking charges a fixed fee per delivery. Mr. Frost, GNF's owner, last year renewed its contract with both Henniker Lumberyard and Bedford Trucking. The lumberyard agreed to keep its prices the same while Bedford Trucking cut its delivery charge by 15%. Roberta, GNF's purchasing manager has been ordering under the new contracts for several months. Today Mr. Frost got the following email from Roberta: Here are the latest numbers on the Bedford Trucking account. Note that we are using lumber at the same rate as last year but because of the new contract with Bedford ou ptal shipping costs are down 15%. Should Mr. Frost be pleased with Roberta's work? Why or why not? The first word of your answer should be "yes" or "no