A customer goes short $8$ silver contracts. His trade is executed at $416\mathrm{.}5$ cents per ounce $($contract size $=5,000$ troy ounces, minimum tick is $\mathrm{.}5$ cents$/$oz$.).$ Initial margin is $$1,200$ per contract, and maintenance margin is $$1,000.$ At what price will the customer receive a call for additional margin?