Annual percentage rate

A bank had offered to lend AGD Co $320000 for a period of five years at a before-tax rate of 10% per year with Interest payable every six months. Required: Caculate the annual percentage rate implied by the banks offer to lend at 10% per year with interest payable every six months. (Come from passed paper12/05) I think APR?10? and EAR=(1+10%/2)²?1 but the answer told me APR=(1+10%/2)²?1 I feel very confused,am lright or the answer is right? Thanks a lot!!!