C# multiply percentage in datagridview %

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C#

WinForms

I have a datagridview that has a percentage symbol in the cell. I need to convert to a percentage before calculating. The data looks like 17% and I need it to look like 0.17.

What I have tried:

string cellValue;
              cellValue = dataGridView1.Rows[i].Cells[17].Value.ToString(); // % Cycle Remaining
              cellValue = cellValue.Replace("%", "");
              dataGridView1.Rows[i].Cells[17].Value = cellValue ;  // % Cycle Remaining


              int a = Int32.Parse(tb_OrderCycle.Text);
              int b = Convert.ToInt32(dataGridView1.Rows[i].Cells[17].Value);  // % Cycle Remaining
              int C = a * b ;
              dataGridView1.Rows[i].Cells[32].Value = C; //Min. into Cycle