The phrase "add a substantial amount" is correct and usable in written English.
You can use it when discussing the increase of quantity, value, or significance in various contexts, such as finance, cooking, or project management.
Example: "To improve the flavor of the dish, you should add a substantial amount of salt."
Alternatives: "include a significant quantity" or "contribute a considerable amount."
If that were the case, and all Deliveroo's ~15,000 riders in the UK were given worker status, Warne said it would add a "substantial" amount of cost to the business — saying this would shake out to around an additional £1 to delivery costs per hour.
They add a substantial amount of extra cost to an already expensive procedure.
Firstly, the porphyrin moieties are located inside the membrane, and thus, add a substantial amount of mass to the membrane forcing it to expand.
It has been demonstrated [ 31, 32] that heat-moisture exchangers increase resistance to flow and add a substantial amount of dead space when compared with heated humidifiers.
Not only are these products vegetarian-friendly, they also add a substantial amount of protein to your diet.
To use this remedy: Warm some bathwater, and add a substantial amount of Epsom salt in the water before stirring, around 1/2 cup or more.
After seeing the short entry on Ms. Barker, Ms. Gardner added a substantial amount of background.
And the publishing of the sister title will have added a substantial amount of red ink to the accounts.
It added: "A substantial amount of public money would have been saved had the president raised his concerns in time".
The report added: "A substantial amount of work remains to be done to prepare for a planning inquiry, which would not be expected to start before spring 2008 and is unlikely to conclude before 2010".
Apple has added a substantial amount of additional photo editing options to iOS 8. Once you have taken your photo, select Edit in the top right hand corner and at the bottom of the screen tap the third icon from the left, which looks like a small control knob.
