Osiem Ltd contributes to the pension fund of employees at a rate of 10% of gross salaries. For convenience, Osiem pays GH500,000 per month into the pension scheme with any balance paid in the first month of the following accounting year. The wages and salaries for 2020 are GH62 million. Required: Calculate the pension expense for 2020, and the accrual/prepayment at the end of the year.