T Co usually has a quarterly labour cost of $2,500,000. Material costs (mainly copper) were $3,000,000 in January to March. The worldwide cost of copper has increased in the second quarter by 15%. Overheads were $45,000,000 in January to March. Which TWO of the following variances for April to June are worth investigating as the reasons for the variance are unknown? 0 Total direct labour variance of $400 adverse o Overhead expenditure variance of $4,000,000 adverse o Materials price variance of $450,000 adverse o Sales volume variance of $3,000,000 favourable