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by reason of the increase or decrease in said Index being expressed in 1/100's of shall be computed as a discount or premium; any such premium or discount shall be added to or deducted from, as the case may be, the premium, if any, stated in the bid and the remaining premium or discount, if any, shall be added to or deducted from the purchase price of the bonds to be delivered in the second installment. In no event shall any such adjustment be made so as to result in a coupon rate or rates in excess of six per cent (6$) per annum and an interest yield of more than six per cent (6$) per annum, computed to average maturity according to standard tables of bond values. Notwithstanding any provisions herein which might require a greater adjustment by reason of an increase in the interest yields of said Index between the award edition and the delivery edition, the successful bidder must accept and take delivery of bonds in said second installment at an interest rate or rates and an interest yield which do not exceed the maximums specified in this paragraph. A certified or cashier*s check drawn on a responsible bank or trust company in the sum of $200,000 payable to the order of Las Vegas Valley Water District must accompany each proposal as a guaranty that the bidder, if successful, will accept and pay for said bonds in accordance with the terms of his bid. The proceeds of the check accompanying any accepted 15