Please solve this problem using below formula and the offer is offered for one month. Compute EOQ with promotion

Dominick's supermarket chain sells Nut Flakes, a popular cereal manufactured by the Tastee cereal company. Demand for Nut Flakes is 1000 boxes per week. Dominick's has a holding cost of 25 percent and incurs a fixed trucking cost of $200 for each replenishment order it places with Tastee.

Tastee normally charges $2 per box of Nut Flakes. Tastee runs a trade promotion, lowering the price of Nut Flakes to $1.80 for a month.

What is the optimal lot size for Dominick's the promotion? Assume 52 weeks in a year. using formula

(Cell D10) = dD/(C-d)h+(CQ^)/(C-d)