the weed killer company uses$($i$.$e$.,$ demand rate$)30$ gallons of weed kill per day. The supply of weed kill is replenisehd when the amount on hand is $190$ gallons $9$i$.$e$.,$ reorder point$).$ After an order is placed, it takes about three days on average to receive the order. Saftey stock is $100$ gallons, which provides a $3\%$ stockout risk. What amount of saftey stock would provide a stockout risk of $15\%?$ assume lead time is distributed normally; therefoe, the lead time will have a standard deviation that you need to intially solve for.