$\backslash$table$[[,,$Fluctuating Market,$],[,$Regular Investment,Share Price,Shares Acquired$],[$Period $1$:$,$$$400,$$$25,16],[$Period $2$:$,400,20,20],[$Period $3$:$,400,25,16],[$Period $4$:$,400,20,20],[$Period $5$:$,400,25,16],[$Totals:$,$$$2,000,$$$115,88],[,$Average share price:,$],[,$Average share cost:,$],[,$Declining Market,$],[$Regular Investment,Share Price,Shares Acquired$],[$Period $1$:$,$$$400,$$$25,16],[$Period $2$:$,400,20,20],[$Period $3$:$,400,20,20],[$Period $4$:$,400,10,40],[$Period $5$:$,400,8,50],[$Totals:$,$$$2,000,$$$83,146],[,$Average share price:,$],[,$Average share cost:,$]]$