Coles supermatket is currently offering a Platinum No MasterCard credit card wiith an interest rate of 19.99% per annum (APR) calculated daily on purchases and cashadvances ,but with upto 62 days interest free onn purchases if you pay the fulll balance off each month.If you buy $1000 of purchases at the start pf the cycle and pay the full amount when due 62days later, how much interest charge are you avoiding?