How Much DME for a 1,5 Liter Starter?

I am going to do a starter for my Black IPA extract kit. Mr. Malty says to do a 1.5 L starter, how much DME should I use?

It seems most starters achieve a 1.040 OG from a 1/2 cup of DME from a 1 L starter. Just want to know if I am making a 1.5 L starter if I need to add more DME, or just more water?

Thanks!

100 g per liter of water will give an SG of ~1.035. So, 150 g.

Thanks! I made my first starter today.