Prepare Payment Certificate No. 6 in the prescribed format. Calculate the payment due to the main contractor for that particular month with the following information. Pls, do it step by step for my understanding. Certificate No. 6 means the owner has been paying for the last 5 months of work done and now have to calculate for the 6 months payment of the work done.

Contract sum $5,000,000

Retention for work done 10%

Retention for unused materials on site 20%

Limit of retention 5% of contract sum

Value of work done to date $1,200,000

Value of unused materials on-site $200,000

Accumulated payment paid to contractor $1,100,000

$50,000 was spent from the provisional sum for piling.

Value of work done by the nominated subcontractor for electrical installations was $100,000.