Both the insurer and the insured are entitled to terminate this insurance upon 30 (thirty) days notice in writing being given. Such termination should be effected of the registered letter. When the insurer terminated the insurance, he is obliged to return prorata premium for the unexpired period of insurance. If it is the Insured who terminated the insurance, premium will be calculated on the short term rate laid down in the current fire Insurance tariff of Indonesia for the completed period of insurance