Q.4096 ABC Credit Union is launching a new deposit campaign next week in anticipation of bringing in from $200 million to $700 million in new deposit money, which it expects to invest at a 7% yield. The management believes that an offer rate on new deposits of 3% would attract $200 million in new deposits and rollover funds. To attract $300 million, the bank would probably be forced to offer 4%. ABC’s forecast suggests that $400 million might be available at 4.25%, $500 million at 4.50%, $600 million at 4.75%, and $700 million at 5.25%. What volume of deposits should the institution try to avoid to ensure that marginal cost does not exceed marginal revenue?